Is the lone-pair of electrons on the ammonia molecule delocalized?
Answer 1:
Not to my knowledge………
Explanation:
We gots \(H_{3} N: \ldots\) the lone pair is localized on the nitrogen atom, and this is the nucleophilic centre.
On the other hand, the nitro group, \(\mathrm{NO}_{2}^{-} \text {or }^{-} \mathrm{C} \equiv \mathrm{N}:\) could potentially bind thru either atom in the molecule. As always, the organic chemist exploits reaction conditions that select a particular reactivity.
Answer 2:
No it’s not.
Explanation:
Ambident nucleophiles have negative charge delocalised over two unlike atoms (or over two like, but not equivalent atoms). Things like enolates would be ambident nucleophiles, but in ammonia \(\mathrm{NH}_{3}\) there is no such delocalisation.