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There are two NH2 groups in semicarbazide. However only one is involved in the formation of semicarbazone. Why?
Kindly answer sir/mam. 

Kindly refer to the following link:
https://www.meritnation.com/ask-answer/question/give-a-plausible-explanation-for-each-one-of-the-following/chemistry/4070633

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This is bcoz the nh2 group adjacent to carbonyl carbon is involved in resonance and hence its electron density decreases and it cant act as a nucleophile.
So the nh2 grp away fron carbonyl carbon acts a s a nucleophile
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