MHT CET 2022 Chemistry question

Which of the following reagents is used in Gatterman - Koch formylation of arene?

(A)CO, HCl / (anhydrous)Correct
(B),
(C)
(D)/h,

Answer: (A)

Solution

In the Gattermann-Koch reaction benzene (or an arene) is treated with carbon monoxide and hydrogen chloride in the presence of anhydrous (with traces of CuCl); the electrophile is the formyl cation and the product is benzaldehyde: C_6H_6$ + CO + HCl

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Question ID VK-095932