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When acetaldehyde undergoes condensation with semicarbazide, the product formed is semicarbazone. Which of the following represents its structure?

1. CH3CH=N–NHCONH–CH3
2. CH3CH=N–NHCONH2
3. CH3CH=N–N(OH)–CONH2
4. CH3CH=N–CONHNH2

Correct answer: CH3CH=N–NHCONH2

Solution

The correct option, CH3CH=N–NHCONH2, accurately represents the structure of semicarbazone formed from the condensation of acetaldehyde and semicarbazide, featuring the characteristic semicarbazone functional group with the appropriate bonding and functional groups.

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