Discussion
Benzoyl chloride is converted to benzaldehyde by
Answer: E
The conversion is the Rosenmund reaction.
In the Rosenmund reduction an acid chloride is hydrogenated over palladium on barium sulphate, poisoned with sulphur or quinoline so that the reduction stops at the aldehyde: C6H5COCl + H2 → C6H5CHO + HCl.
The Etard reaction oxidises toluene to benzaldehyde with chromyl chloride; the Stephen reaction reduces a nitrile; the Gattermann-Koch reaction formylates benzene with CO and HCl; and the Gattermann reaction converts a diazonium salt using copper powder. None starts from benzoyl chloride.
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