Question

Which of the following is not an electrophile ? (a) NH3 (b) BF3 (c) AlCl3 (d) SO3

Answer 1

It is NH3 only as it doesn't have d-orbitals to extend its valency.

Answer 2

$\bold{\mathrm{NH}_{3}}$ is not an electrophile.

Option: (a)

Explanation:  

• Electrophile are those ions or compounds which are either positively charged or have vacant orbitals in it so that they can attract an electron towards it.  

• Ammonia consists of Nitrogen which does not have D orbital. On the other hand it has a lone pair of electron which repels when other electron approach towards it.  

• As a result ammonia can never act as an electrophile. This is because there is repulsion between the lone pair of electron and other approaching electrons.

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