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**Rosenmund's reduction** converts an acyl chloride to an aldehyde using

A$H_2/Pd-BaSO_4$ (poisoned)
B$LiAlH_4$
C$Zn/HCl$
D$NaBH_4$
Answer & Solution
Correct answer: A. $H_2/Pd-BaSO_4$ (poisoned)
$RCOCl + H_2 \xrightarrow{Pd/BaSO_4} RCHO + HCl$. Catalyst is deliberately poisoned (with quinoline/sulphur) to stop over-reduction to the alcohol.
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