(A) When acetic acid $(CH_3COOH)$ reacts with phosphorus pentachloride $(PCl_5)$,the hydroxyl group $(-OH)$ of the carboxylic acid is replaced by a ch

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(A) When acetic acid $(CH_3COOH)$ reacts with phosphorus pentachloride $(PCl_5)$,the hydroxyl group $(-OH)$ of the carboxylic acid is replaced by a chlorine atom. The reaction is: $CH_3COOH + PCl_5 \to CH_3COCl + POCl_3 + HCl$ The products formed are acetyl chloride $(CH_3COCl)$,phosphoryl chloride $(POCl_3)$,and hydrogen chloride $(HCl)$.