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Identify compound (A) in the following reaction: $A\xrightarrow{H_2/Pd\text{-}BaSO_4}C_6H_5CHO$ (benzaldehyde)
A
Benzoic acid
B
Benzoyl chloride
C
Toluene
D
Acetophenone
Detailed Solution
In the Rosenmund reduction, an acid chloride is selectively reduced to an aldehyde using $H_2$ over a poisoned Pd-$BaSO_4$ catalyst. So A must be benzoyl chloride ($C_6H_5COCl$), which is reduced to benzaldehyde.