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Benzaldehyde reacts with ethanoic KCN to give

1. C6H5CHOHCN
2. C6H5CHOHCOC6H5
3. C6H5CHCOOH
4. C6H5CHOHCOHC6H5

Correct answer: C6H5CHOHCN

Solution

Benzaldehyde reacts with KCN in the presence of ethanoic acid to undergo nucleophilic addition, forming benzaldehyde cyanohydrin (C6H5CHOHCN).

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