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Consider the reaction: RCHO + NH2NH2 → RCH=N–NH2. What sort of reaction is it?

1. Electrophilic addition – elimination reaction
2. Free radical addition – elimination reaction
3. Electrophilic substitution – elimination reaction
4. Nucleophilic addition – elimination reaction

Correct answer: Nucleophilic addition – elimination reaction

Solution

The reaction involves the nucleophilic attack of NH2NH2 (hydrazine) on the carbonyl carbon of RCHO, followed by elimination of water, forming a hydrazone. This is a classic nucleophilic addition-elimination reaction.

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