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NEET levelSingle correct optionDifficulty 1 of 3co062

Benzaldehyde is warmed with aqueous-alcoholic KCN. The product of this benzoin condensation is

A2-hydroxy-1,2-diphenylethanone
B1,2-diphenylethane-1,2-dione
Cphenylmethanol
D1,2-diphenylethane-1,2-diol

Answer: A

Cyanide catalyses coupling of two benzaldehyde molecules. The product is

C X_{6} H X_{5} CH (OH) COC X_{6} H X_{5}

, 2-hydroxy-1,2-diphenylethanone (benzoin). Benzil is its oxidation product and is not formed here.

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