Identify reagents A and B required for the following transformation of acyl groups:

Question

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The transformation of acyl groups involves the conversion of a carboxylic acid to an acyl chloride using thionyl chloride (SOCl2) or oxalyl chloride (COCl) in the presence of pyridine. This is represented by the first reagent, A = (COCl)₂. The acyl chloride can then be reacted with an alcohol in the presence of a base to form an ester, but in this case, the second reagent, B = C₂H₅COOH, suggests that the alcohol is replaced with water to form a carboxylic acid. Therefore, the best choice is B, where A is (COCl)₂ and B is C₂H₅COOH.

Identify Reagents a and B Required for the Following Transformation