Benzaldehyde can be prepared from benzene by passing vapours of CO and hydrochloric acid in its solution in presence of catalyst mixture of $A l C l_{3} / C u C l$ . The reaction is known as Gattermann-Koch reaction.

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Benzaldehyde can be prepared from benzene by passing vapours of CO and hydrochloric acid in its solution in presence of catalyst mixture of $A l C l_{3} / C u C l$ . The reaction is known as Gattermann-Koch reaction.

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