{"id":4969,"date":"2012-04-16T15:47:46","date_gmt":"2012-04-16T15:47:46","guid":{"rendered":"https:\/\/www.masterorganicchemistry.com\/?p=4969"},"modified":"2026-04-18T06:12:50","modified_gmt":"2026-04-18T11:12:50","slug":"basicity-trends-organic-chemistry","status":"publish","type":"post","link":"https:\/\/www.masterorganicchemistry.com\/2012\/04\/16\/basicity-trends-organic-chemistry\/","title":{"rendered":"Factors That Affect Base Strength In Organic Chemistry"},"content":{"rendered":"<p><strong>Basicity In Organic Chemistry: Some Basicity Trends<\/strong><\/p>\n<p>In this article we go through some important\u00a0<strong>basicity trends<\/strong> in organic chemistry. (<span style=\"color: #993366;\"><em>Previous article &#8211; <a href=\"https:\/\/www.masterorganicchemistry.com\/2010\/09\/22\/five-key-factors-that-influence-acidity\/\">Acidity Trends<\/a><\/em><\/span>)<\/p>\n<ul>\n<li>The <strong>stronger<\/strong> the <strong>acid<\/strong>, the <strong>weaker<\/strong> the<strong> conjugate base; <\/strong>any factor which <strong>stabilizes\u00a0<\/strong>the\u00a0<strong>conjugate base<\/strong>\u00a0has the effect of\u00a0<strong>increasing acidity<\/strong>.<\/li>\n<li>OK, great. But what if we&#8217;re asked to determine which\u00a0<strong>base<\/strong> is\u00a0<strong>stronger<\/strong>? How do we do that?<\/li>\n<li>By flipping our trends around!<\/li>\n<li>One way of thinking about\u00a0<strong>base strength\u00a0<\/strong>is &#8220;<strong>instability&#8221;\u00a0<\/strong>of a pair of electrons.<\/li>\n<li>So any factor which\u00a0<strong>destabilizes<\/strong> the conjugate base&#8230;. increases basicity.<\/li>\n<li>For instance,\u00a0<em>removing\u00a0<\/em>resonance&#8230; increases basicity;\u00a0<em>removing<\/em> electron-withdrawing groups&#8230;increases basicity;\u00a0<em>decreasing\u00a0<\/em>electronegativity of the atom&#8230; increases basicity.<\/li>\n<li>In other words,\u00a0<strong>basicity<\/strong> will be\u00a0<strong>increased<\/strong> by the\u00a0<strong>opposite<\/strong> of any factor which\u00a0<strong>increases acidity<\/strong>.<\/li>\n<li>Avoid the common misconception that &#8220;weak acids are strong bases&#8221;. Not true! Methane (CH<sub>4<\/sub>) is a weak acid, but cannot act as a base since it lacks a lone pair of electrons. The proper phrasing is that &#8220;weak acids have strong\u00a0<strong>conjugate\u00a0<\/strong>bases&#8221;. \u00a0The conjugate base of CH<sub>4<\/sub>, CH<sub>3<\/sub>(-) is an extremely strong base.<\/li>\n<\/ul>\n<p>After reading this article, you should be better at spotting basicity trends. You can test yourself with lots of quizzes on this topic at the bottom.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-38638\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2024\/12\/0-summary-factors-that-affect-basicity-remove-delocalization-electron-donating-groups-decrease-s-character.gif\" alt=\"summary-factors that affect basicity remove delocalization electron donating groups decrease s character\" width=\"640\" height=\"641\" \/><\/a><\/p>\n<ol>\n<li><a href=\"#one\">&#8220;Basicity&#8221; Is Just Another Word For &#8220;Stability Of A Lone Pair Of Electrons&#8221;<\/a><\/li>\n<li><a href=\"#two\">First Things First: Basicity Requires a Lone Pair of Electrons<\/a><\/li>\n<li><a href=\"#three\">Basicity Increases With Increasing Negative Charge<\/a><\/li>\n<li><a href=\"#four\">Basicity Increases With Decreasing Electronegativity and Size Of Atom<\/a><\/li>\n<li><a href=\"#five\">Basicity and Resonance<\/a><\/li>\n<li><a href=\"#six\">Basicity and Inductive Effects<\/a><\/li>\n<li><a href=\"#seven\">Basicity Increases As s-orbital Character Decreases<\/a><\/li>\n<li><a href=\"#eight\">One Approach To Solving &#8220;What&#8217;s The Strongest Base&#8221; Problems<\/a><\/li>\n<li><a href=\"#nine\">A Final Word of Caution<\/a><\/li>\n<li><a href=\"#notes\">Notes<\/a><\/li>\n<li><a href=\"#quizzes\">Quiz Yourself!<\/a><\/li>\n<\/ol>\n<hr \/>\n<h2><strong><a id=\"one\"><\/a>1. &#8220;Basicity&#8221; Is Just Another Word For &#8220;Stability Of A Lone Pair Of Electrons&#8221;<\/strong><\/h2>\n<p>We&#8217;ve learned 5 key factors to look at that determine acidity.<\/p>\n<p>The natural next question is, well,\u00a0 what about factors that the affect <strong>basicity<\/strong>?<\/p>\n<p>Good news: they are the\u00a0<strong>same factors<\/strong>. But they work in\u00a0<strong>opposite directions<\/strong>.<\/p>\n<p>Recall that\u00a0<strong>acidity<\/strong> is determined by the equilibrium:<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-43833\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/1-equilibrium-constant-for-acidity-going-from-ha-to-proton-and-conjugate-base-as-base-is-made-less-stable-equilibrium-goes-to-left.gif\" alt=\"equilibrium constant for acidity going from ha to proton and conjugate base - as base is made less stable equilibrium goes to left\" width=\"640\" height=\"139\" \/><\/a><\/p>\n<ul>\n<li>The further this equilibrium goes from <strong>left<\/strong> to <strong>right<\/strong>, the <strong>stronger<\/strong> the <strong>acid<\/strong>.<\/li>\n<li>Any factor which stabilizes the conjugate base A(-)\u00a0<strong>increases\u00a0<\/strong>acidity.<\/li>\n<\/ul>\n<p>So what does this mean for basicity?<\/p>\n<p>If we want to think about factors that<strong>\u00a0<\/strong>increase\u00a0<strong>basicity<\/strong>, then we need to look at this equilibrium from\u00a0<strong>right\u00a0<\/strong>to\u00a0<strong>left.\u00a0<\/strong><\/p>\n<ul>\n<li>The further this equilibrium goes from <strong>right<\/strong> to <strong>left<\/strong>, the stronger the\u00a0<strong>base<\/strong>.<\/li>\n<li>Any factor which\u00a0<strong>destabilizes<\/strong> the conjugate base A(-)\u00a0<strong>increases<\/strong>\u00a0basicity.<\/li>\n<\/ul>\n<p>That&#8217;s right. We can really just think of\u00a0<strong>basicity\u00a0<\/strong>as &#8220;instability of a lone pair of electrons&#8221;. The more unstable a pair of electrons is, the more basic it will be.<\/p>\n<p>So here are the two sides of the same coin:<\/p>\n<ul>\n<li>The <strong>stronger<\/strong> the <strong>acid<\/strong>, the <strong>weaker<\/strong> the <strong>conjugate base<\/strong>, and<\/li>\n<li>The <strong>weaker<\/strong> the <strong>acid<\/strong>, the <strong>stronger<\/strong> the<strong> conjugate base<\/strong>.<\/li>\n<\/ul>\n<p>In this article, let&#8217;s look again at the five factors that influence acidity, but we will look at it through the lens of\u00a0<strong>basicity<\/strong> instead.<\/p>\n<h2><a id=\"two\"><\/a>2. First Things First: Basicity Requires A Lone Pair<\/h2>\n<p>Let&#8217;s start with a simple point.<\/p>\n<p>Recall that one definition of basicity (Lewis basicity) states that a base is an electron-pair\u00a0<strong>donor<\/strong>.<\/p>\n<p>If a molecule or atom can&#8217;t donate a lone pair of electrons, it can&#8217;t be a base.<\/p>\n<p><span style=\"color: #800080;\"><em>(For our purposes here, this means &#8220;it must have a lone pair of electrons&#8221;. Later on you might see examples like BH<sub>4<\/sub>(-) and AlH<sub>4<\/sub>(-) which are basic since they can readily donate H(-) but we&#8217;re not going to deal with that right now).\u00a0<\/em><\/span><\/p>\n<p>CH<sub>4<\/sub> is <strong>not a base<\/strong> since there is no lone pair of electrons on carbon. Same for ethane, hexane, cyclopentane and other alkanes.<\/p>\n<p>Similarly, NH<sub>4<\/sub>+ is not a base since there is no lone pair on nitrogen.<\/p>\n<p>So any discussion about the &#8220;base strength&#8221; of molecules like this just ends with &#8211; no lone pair, not a base, discussion over.<\/p>\n<h2><a id=\"three\"><\/a>3. Basicity Increases With Increasing Negative Charge<\/h2>\n<p>If acidity increases as the positive charge is increased, then it follows that <strong>basicity<\/strong> <strong>increases<\/strong> as <strong>negative charge<\/strong> is <strong>increased.\u00a0<\/strong><\/p>\n<p>Increasing the density of negative charge is destabilizing and we would predict this to increase basicity.<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-43853\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/2-basicity-increases-with-increasing-negative-charge-on-the-atom-basicity-trends-rev2.gif\" alt=\"basicity increases with increasing negative charge on the atom basicity trends-rev2\" width=\"640\" height=\"407\" \/><\/a><\/p>\n<p>This is another way of saying that a <strong>conjugate base<\/strong> is always a stronger base than its parent acid, since a conjugate base is what&#8217;s left over after a molecule loses H+ (that is, its charge becomes more negative by 1).<\/p>\n<p>I realize this may fall into the &#8220;water is wet&#8221; category of obvious observations for some people, but sometimes it&#8217;s helpful to have this clearly spelled out. :-)<\/p>\n<p>In Gen Chem you might have done some titrations of phosphate ion and learned that (PO<sub>4<\/sub>)3- is more basic than [HPO<sub>4<\/sub>]2- which is more basic than [H<sub>2<\/sub>PO<sub>4<\/sub>]- which is more basic than phosphoric acid. Same idea.<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43866\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43866\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43866\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43866\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43866\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43866 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43866\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-bgezo\" data-id=\"bgezo\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3718-Front-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3718-Reverse-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<h2><a id=\"four\"><\/a>4. Basicity Increases Depending On Electronegativity and Size Of The Atom<\/h2>\n<p>If acidity increases as the atom becomes more electronegative going from left to right across the periodic table, then we should predict that <strong>basicity<\/strong> <strong>increases<\/strong> as <strong>electronegativity<\/strong> <strong>decreases<\/strong> going from <strong>right<\/strong> to <strong>left<\/strong> along the periodic table.<\/p>\n<p>This means that CH<sub>3<\/sub>(-) is a stronger base than NH<sub>2<\/sub>(-) which in turn is a stronger base than HO(-) which is stronger than F(-).<\/p>\n<p>It also applies to\u00a0<strong>neutral\u00a0<\/strong>compounds; it helps to explain why\u00a0<strong>amines<\/strong> are more basic than\u00a0<strong>alcohols<\/strong> which in turn are more basic than alkyl halides; the electron pair isn&#8217;t held as tightly!<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43835\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/4-across-a-row-of-the-periodic-table-basicity-increases-as-electronegativity-decreases-methyl-anion-more-basic-than-hydroxide-and-fluoride.gif\" alt=\"across a row of the periodic table basicity increases as electronegativity decreases methyl anion more basic than hydroxide and fluoride\" width=\"640\" height=\"595\" \/><\/a><\/p>\n<p>Try this quiz:<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43867\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43867\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43867\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43867\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43867\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43867 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43867\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-uckn9\" data-id=\"uckn9\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3719-Front-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3719-Reverse-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<p>We also saw that\u00a0<strong>acidity<\/strong> increases going down a column of the periodic table (H-F, H-Cl H-Br H-I) since the negative charge is spread out over a much larger volume as the size of the atom increases (greater polarizability). Negative charge in the iodide ion (I-) is more stable than it is in the fluoride ion (F-) since the same charge of -1 is spread out over a larger volume.<\/p>\n<p>Conversely,\u00a0<strong>basicity<\/strong> should\u00a0<strong>increase<\/strong> going\u00a0<strong>up<\/strong> a column of the periodic table since the negative charge is spread out over a smaller volume.<\/p>\n<p>So F(-) is more unstable (more basic!) than Cl(-), which is more basic than Br(-), which in turn is more basic than I(-).<\/p>\n<p>This also helps to explain why alkoxides (RO(-) ) are <strong>more basic<\/strong> than thiolates (RS(-) and also why neutral alcohols (ROH) are <strong>more basic<\/strong> than thiols (RSH). Same idea.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43836\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/6-basicity-decreases-going-down-a-column-of-the-periodic-table-fluroide-more-basic-than-iodide.gif\" alt=\"-basicity decreases going down a column of the periodic table fluroide more basic than iodide\" width=\"640\" height=\"496\" \/><\/a><\/p>\n<p>Think you understand the concept? Try this quiz:<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43868\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43868\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43868\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43868\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43868\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43868 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43868\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-haebc\" data-id=\"haebc\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3720-Front-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3720-Reverse-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<h2><a id=\"five\"><\/a>5. Basicity and Resonance<\/h2>\n<p>We&#8217;ve seen that acidity\u00a0<strong>increases<\/strong> if the conjugate base can be stabilized through resonance, since that lone pair of electrons can be distributed over a greater volume (&#8220;delocalization&#8221;).<\/p>\n<p>What happens if you take resonance away? That would make the lone pair\u00a0<strong>less stable &#8211;\u00a0<\/strong>more basic, in other words.<\/p>\n<p>Compare the conjugate bases of phenol and cyclohexanol:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43837\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/8-resonance-decreases-basicity-if-lone-pair-is-conjugated-and-in-a-pi-system-basicity-decreases.gif\" alt=\"resonance decreases basicity - if lone pair is conjugated and in a pi system basicity decreases\" width=\"640\" height=\"600\" \/><\/a><\/p>\n<p>It also helps to explain why\u00a0<strong>amines<\/strong> adjacent to aromatic rings are\u00a0<strong>less basic\u00a0<\/strong>than amines that can&#8217;t be delocalized through resonance. When lone pairs can be delocalized through resonance, that makes the lone pair more stable, and therefore less basic.<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43869\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43869\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43869\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43869\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43869\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43869 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43869\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-3j1o5\" data-id=\"3j1o5\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3721-Front-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3721-Reverse-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<h2><a id=\"six\"><\/a>6. Basicity and Inductive Effects<\/h2>\n<p>Hopefully you&#8217;re starting to get the picture by now that any factor which\u00a0<strong>increases acidity<\/strong>,\u00a0<strong>decreases the basicity of the conjugate base<\/strong>.<\/p>\n<p>So all we have to do to increase basicity is to\u00a0<strong>remove\u00a0<\/strong>this factor.<\/p>\n<p>Let&#8217;s look at inductive effects now.<\/p>\n<p>Remember that strongly electronegative atoms (e.g. fluorine, chlorine) draw electron density away from a\u00a0 negative charge and help to stabilize it.<\/p>\n<p>That&#8217;s why 2,2,2-trifluoroethanol is a stronger acid than ethanol.<\/p>\n<p>If we know this, then we would predict that if the electron withdrawing groups are removed, then we should <strong>increase<\/strong> basicity (<span style=\"color: #993366;\"><em>spoiler: this is true<\/em><\/span>)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43838\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/10-basicity-increases-as-electron-withdrawing-groups-are-removed-and-as-electron-donating-groups-are-added.gif\" alt=\"basicity increases as electron withdrawing groups are removed and as electron donating groups are added\" width=\"640\" height=\"503\" \/><\/a><\/p>\n<p>Basicity is increased even more if there are electron-donating groups nearby that make the negative charge even less stable.<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43870\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43870\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43870\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43870\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43870\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43870 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43870\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-w9tv1\" data-id=\"w9tv1\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3722-Front-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3722-Reverse-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<h2><a id=\"seven\"><\/a>7. Basicity Increases As s-orbital Character Decreases<\/h2>\n<p>Here&#8217;s the last item on our list: orbitals.<\/p>\n<p><em>s<\/em>-orbitals are closer to the nucleus than <em>p<\/em>-orbitals. When a pair of electrons is held more closely to the nucleus, it&#8217;s effectively increasing the electronegativity &#8211; that lone pair feels a greater pull from the nucleus than it would when it&#8217;s in an orbital that&#8217;s farther away.<\/p>\n<p>That&#8217;s why alkyne C-H bonds (<em>sp<\/em>-hybridized, 50% s-character) are more acidic than alkene C-H (<em>sp<\/em><sup>2<\/sup>-hybridized, 33% s-character) and alkane C-H bonds (<em>sp<\/em><sup>3<\/sup>-hybridized, 25% s-character).<\/p>\n<p>So let&#8217;s apply this in reverse.<\/p>\n<p>Alkyl\u00a0<strong>anions<\/strong> [e.g. CH<sub>3<\/sub>(-) ] should therefore be <strong>more basic\u00a0<\/strong>than alkenyl anions, which in turn are more basic than alkynyl anions.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43839\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/12-basicity-increases-as-s-orbital-character-is-decreased-so-sp3-is-more-basic-than-sp2-which-is-more-basic-than-sp.gif\" alt=\"basicity increases as s orbital character is decreased so sp3 is more basic than sp2 which is more basic than sp\" width=\"640\" height=\"592\" \/><\/a><\/p>\n<p>This also works with atoms that are not carbon, as in the quiz below:<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43871\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43871\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43871\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43871\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43871\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43871 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43871\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-xrew5\" data-id=\"xrew5\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3723-Front-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3723-Reverse-acidbase-basicity.gif\" \/>\n\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<h2><a id=\"eight\"><\/a>8. One Approach To Solving &#8220;What&#8217;s The Strongest Base&#8221; Problems<\/h2>\n<p>If you already understand the factors that affect acidity, then you need no new information to solve problems that ask you questions like, &#8220;rank the compounds here in order of increasing basicity&#8221;.<\/p>\n<p>Since acidity increases with decreasing basicity (stability) of the conjugate base, all you need to do is\u00a0<strong>invert<\/strong> the problem.<\/p>\n<p>As Charlie Munger wisely said, &#8220;Invert, always invert&#8221;.<\/p>\n<p>One way to do it is to <strong>redraw all the molecules as their conjugate acids. <\/strong><\/p>\n<p>Then ask yourself, &#8220;What&#8217;s the\u00a0<strong>weakest<\/strong> acid here&#8221;.<\/p>\n<p>The\u00a0<strong>weakest acid<\/strong> will have the\u00a0<strong>strongest\u00a0<\/strong>conjugate base.<\/p>\n<p>Try it:<\/p>\n<div class=\"wq-quiz-wrapper\" data-id=\"43770\"><style type=\"text\/css\" id=\"wq-flip-custom-css\">.wq-quiz-wrapper[data-id=\"43770\"] {\n--wq-question-width: 100%;\n--wq-question-color: #009cff;\n--wq-question-height: auto;\n--wq-font-color: #444;\n}\n\n\t\t\t.wq-quiz-wrapper[data-id=\"43770\"] {\n\t\t\t\t--wq-question-width: 600px;\n\t\t\t}\n\n\t\t\t@media screen and (max-width: 600px) {\n\t\t\t\t.wq-quiz-wrapper[data-id=\"43770\"] .wq_singleQuestionWrapper { width:100% !important; height:auto !important; }\n\t\t\t}\n\t\t<\/style><!-- wp quiz -->\n<div id=\"wp-quiz-43770\" class=\"wq_quizCtr single flip_quiz wq-quiz wq-quiz-43770 wq-quiz-flip wq-layout-single wq-skin-traditional wq-should-show-correct-answer\" data-quiz-id=\"43770\">\n<div class=\"wq-questions wq_questionsCtr\">\n\t<div class=\"wq-question wq_singleQuestionWrapper wq-question-5il8t\" data-id=\"5il8t\">\n\n\t\n\t<div class=\"item_top\">\n\t\t<div class=\"title_container\">\n\t\t\t<div class=\"wq_questionTextCtr\">\n\t\t\t\t<h4 class=\"wq-question-title\"><\/h4>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"card \">\n\t\t<div class=\"front\" >\n\t\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"880\" height=\"666\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3715-Front-acidbase-basicity.gif\" class=\"attachment-full size-full\" alt=\"\" \/>\t\t\n\t\t\n\t\n\t\n\t\t\t<span class=\"top-desc\">Click to Flip<\/span>\n\t<\/div>\n\t\t<div class=\"back\" >\n\t\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"884\" height=\"882\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/2026\/02\/3715-Reverse-acidbase-basicity.gif\" class=\"attachment-full size-full\" alt=\"\" \/>\t\t\n\t\t\n\t\n\t<\/div>\n\t<\/div>\n\n\t\n<\/div>\n<\/div>\n<\/div>\n<!-- \/\/ wp quiz-->\n<\/div><!-- End .wq-quiz-wrapper -->\n<h2><a id=\"nine\"><\/a>9. A Final Word of Caution<\/h2>\n<p>A common misconception students have is that &#8220;weak acids are strong bases&#8221;.<\/p>\n<p><strong>Not true! <\/strong>Methane (CH<sub>4<\/sub>) is a weak acid, but it can&#8217;t act as a base &#8211; it doesn&#8217;t have a lone pair.<\/p>\n<p>The proper way to say it is that &#8220;<strong>weak acids have strong CONJUGATE bases<\/strong>&#8220;. So the conjugate base of CH<sub>4<\/sub>, CH<sub>3<\/sub>(-) is an extremely strong base.<\/p>\n<p>That&#8217;s it!<\/p>\n<hr \/>\n<h2><a id=\"notes\"><\/a>Notes<\/h2>\n<div class=\"related-articles\"><p><strong>Related Articles<\/strong><\/p><ul><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2010\/09\/22\/five-key-factors-that-influence-acidity\/\" class=\"\"><span>Five Key Factors That Influence Acidity<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2010\/09\/29\/how-to-use-a-pka-table\/\" class=\"\"><span>How to Use a pKa Table<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/04\/25\/walkthrough-of-acid-base-reactions-3-acidity-trends\/\" class=\"\"><span>Walkthrough of Acid-Base Reactions (3) \u2013 Acidity Trends<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/2012\/05\/09\/acid-base-reactions-ka-and-pka\/\" class=\"\"><span>Acid-Base Reactions: Introducing Ka and pKa<\/span><\/a><\/li><li><a href=\"https:\/\/www.masterorganicchemistry.com\/organic-chemistry-practice-problems\/acid-base-practice-problems\/\" class=\"\"><span>Acid Base Practice Problems (MOC Membership)<\/span><\/a><\/li><\/ul><\/div>\n<hr \/>\n<h2><a id=\"quizzes\"><\/a>Quiz Yourself!<\/h2>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3583-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/0290-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/0289-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/0296-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/2371-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/2372-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3711-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <br \/>\n<\/p>\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3712-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3713-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3714-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3716-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n\n<p class=\"p1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-26714\" src=\"https:\/\/www.masterorganicchemistry.com\/wp-content\/uploads\/quiz-previews\/3717-Front-Image-Only.png\" alt=\"\" width=\"640\" height=\"616\" \/><\/p>\n<p><a href=\"https:\/\/www.masterorganicchemistry.com\/moc-membership\/\"><strong>Become a\u00a0 MOC member<\/strong><\/a> to see the clickable quiz with answers on the back. <\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Basicity In Organic Chemistry: Some Basicity Trends In this article we go through some important\u00a0basicity trends in organic chemistry. (Previous article &#8211; Acidity Trends) The <\/p>\n","protected":false},"author":1,"featured_media":38638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1407],"tags":[164,530,176,177,688,586,254,514,803],"post_folder":[],"class_list":["post-4969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acid-base-reactions","tag-acids","tag-anions","tag-bases","tag-basicity","tag-conjugate-acid","tag-conjugate-base","tag-pka","tag-stability","tag-trends"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Basicity Is Another Word For &quot;Stability Of A Lone Pair Of Electrons&quot;<\/title>\n<meta name=\"description\" content=\"Basicity trends in organic chemistry generally follow the principle that the less stable a lone pair of electrons is, the more basic it is. Let&#039;s explore:\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.masterorganicchemistry.com\/2012\/04\/16\/basicity-trends-organic-chemistry\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Basicity Is Another Word For &quot;Stability Of A Lone Pair Of Electrons&quot;\" \/>\n<meta property=\"og:description\" content=\"Basicity trends in organic chemistry generally follow the principle that the less stable a lone pair of electrons is, the more basic it is. 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