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What is the product of the reaction between acetaldehyde and semicarbazide?

1. CH3CHO reacts with H2N—NH—C—NH2 to yield CH3—CH=N—NH—C—NH2
2. CH3CHO reacts with H2N—NH—C—NH2 to yield CH3—CH=N—NH—C—NH2 along with H2O
3. CH3CHO reacts with H2N—NH—C—NH2 to yield CH3—CH=N—NH—C—NH2 along with HCl
4. CH3CHO reacts with H2N—NH—C—NH2 to yield CH3—CH=N—NH—C—NH2 along with NH3

Correct answer: CH3CHO reacts with H2N—NH—C—NH2 to yield CH3—CH=N—NH—C—NH2 along with H2O

Solution

Acetaldehyde reacts with semicarbazide (H2N—NH—C—NH2) to form acetaldehyde semicarbazone (CH3—CH=N—NH—C—NH2) with the elimination of water (H2O) as a byproduct. This is a condensation reaction.

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