Assertion :There are two ${- N H}_{2}$ groups in semicarbazide Reason: One group is involved in the formation of semicarbazones

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
There are two $- N H_{2}$ group in semicarbazide. However, only one is involved in the formation of semicarbazone since one $- N H_{2}$ group adjacent to carbonyl carbon is involved in resonance, hence it's electron density decreases and it cannot act as a nucleophile.
Hence, the only $- N H_{2}$ group away from the carbonyl carbon acts as a nucleophile.

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Assertion :There are two −NH2 groups in semicarbazide Reason: One group is involved in the formation of semicarbazones

Assertion :There are two ${- N H}_{2}$ groups in semicarbazide Reason: One group is involved in the formation of semicarbazones