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JEE Main levelSingle correct optionDifficulty 2 of 3o1123

Benzaldehyde is treated with (i) $HCN$ , trace $KCN$ ; (ii) $H X_{3} O X^{+}$ , heat. The final organic product is

A2-hydroxy-2-phenylethanoic acid (mandelic acid)
Bbenzoic acid
C2-phenylethanoic acid
Dbenzyl alcohol

Answer: A

Step (i) gives

C X_{6} H X_{5} - CH (OH) - CN

. Acid hydrolysis converts the nitrile

- CN

into

- COOH

and leaves the OH untouched, giving

C X_{6} H X_{5} - CH (OH) - COOH

, mandelic acid.

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