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  4. The following reagent is used for introducing a formyl group (—CHO) into the benzene ring

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Q. The following reagent is used for introducing a formyl group $ (—CHO) $ into the benzene ring

AMUAMU 2011Aldehydes Ketones and Carboxylic Acids

Solution:

Gattermann-Koch formyladon When a mixture of $CO$ and $HCl$ gas is passed through a solution of benzene in the presence of anhydrous $AlCl_3$ and $CuCl$, benzaldehyde is formed.
$CO + HCl \rightarrow \underset{\text{formyl chloride}}{[HCOCl]}$
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If $CO$ in this reaction is replaced by $HCN$, the reaction is called Gattermann formylation.
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