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  • Give plausible explanation for each of the following: (ii) There are two –NH _2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones.

Q 12.18     Give plausible explanation for each of the following:

         (ii)     There are two –NH2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones. 

Answers (1)

best_answer

In Semicarbazide,
 


One of the -NH_{2} group is involved in resonance with the carbonyl group, which is directly attached. Therefore, it cannot act as a nucleophile (its electrons are less available or less electron density at that -NH_{2} group). But the other -NH_{2} group is not participating in resonance, so it can act as nucleophile and attack on the carbonyl carbon of ketone and aldehyde.

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