Nucleophile: “nucleus-loving” , i.e. “positive-charge loving”. Electrophile = “electron-loving” i.e. “negative-charge loving”.

They are all electrophilic. The proton of H3O+ is electrophilic. The nitrogen of NO2+ is electrophilic. And the empty p orbital of BH3 is electrophilic. Don’t know where you got this question.

Glad to hear it Hayat!

Well, the “most electrophilic” site would be the atoms directly connected to the most electronegative atom, which is nitrogen. so the carbons will be partially delta positive as will be the hydrogen attached to nitrogen. However in practice diethylamine is an extremely poor electrophile. The only way to make it behave like an electrophile is to add a Lewis acid to the nitrogen or to convert it into an alkylammonium salt with something like CH3I, which will make the nitrogen a much better leaving group.

Thank you!

You are welcome!

(* The oxygen atom of water has two lone pairs and a d- charge (oxygen is more electronegative than hydrogen). This suggests that water can behave an a nucleophile. Each hydrogen atom bears a d+ charge, so the molecule can behave as an electrophile as well.) *Quoted

hey augustin,
basically it is happens lyk..the grp with a large hydrocarbon part comes out to b a good electron donating grp. In general, electron donating grps such as -ch3 , -och3, -nh2 etc. increase the basicity while electron withdrawing substituents such as -NO2 , CN ,-COOH , -X , decrease the basicity .