Question
Benzaldehyde from benzene (Gattermann-Koch synthesis).###Write chemical equation for Gatter- mann-Koch formylation.
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Answer
When benzene is treated with vapours of carbon monoxide and hydrogen chloride in the presence of a catalyst mixture of $A1Cl _3$ and $CuCl$ under high pressure, benzaldehyde is obtained. This reaction is called Gattermann- Koch synthesis.
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