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NEET levelSingle correct optionDifficulty 1 of 3ro113

In the Rosenmund reduction, benzoyl chloride is converted into benzaldehyde by

A $H X_{2}$ over Pd- $BaSO X_{4}$ (poisoned catalyst)
B $H X_{2}$ over Pd-C without any poison
C $LiAlH X_{4}$ followed by $H X_{3} O X^{+}$
DZn-Hg and conc. $HCl$

Answer: A

The Rosenmund reduction uses

H X_{2}

and Pd supported on

BaSO X_{4}

, partly poisoned so that the aldehyde is not reduced further to the alcohol.

LiAlH X_{4}

or unpoisoned Pd-C would go on to benzyl alcohol or toluene, and Clemmensen conditions reduce C=O to

CH X_{2}

.

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