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The reaction of benzaldehyde with KCN in the presence of H2O and C2H5OH leads to the formation of benzoin.

1. C6H5CHO → C6H5CH(OH)C6H5
2. C6H5CHO → C6H5CH2OH
3. C6H5CHO → C6H5COOH
4. C6H5CHO → C6H5CH2CHO

Correct answer: C6H5CHO → C6H5CH(OH)C6H5

Solution

The reaction described is the benzoin condensation, where two molecules of benzaldehyde react in the presence of KCN as a catalyst to form benzoin (C6H5CH(OH)C6H5).

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