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There are two – NH_2group in semicarbazide. However, only one is involved in the formation of semicarbazone. Why? |
Answer» Solution :Although semicarbazide has TWO `– NH_2`GROUPS but only one of them is involved in RESONANCE as shown below: As a result, `e^-`density on one of the `- NH_2`group is REDUCED and hence it does not act as nucleophile.One pair of the other `- NH_2`group is not involved in resonance and hence it is available for nucleophilic attack.
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