Carboxylic Acids Question 124

Question: Acetic acid reacts with $ PCl_5 $ to form

[Pb. CET 2001]

Options:

A) $ CH_3COCl $

B) $ CHCl_2COOH $

C) $ CH_2ClCOOH $

D) $ CH_3COOCl $

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Answer:

Correct Answer: A

Solution:

When acetic acid is reacted with $ PCl_5 $ the product formed are acetyl chloride, phosphoryl chloride and hydrochloric acid $ \underset{Aceticacid}{\mathop{CH_3COOH}}+\underset{\begin{smallmatrix} Phosphorus \\ Pentachloride \end{smallmatrix}}{\mathop{PCl_5}}\to \underset{\begin{smallmatrix} Acetyl \\ Chloride \end{smallmatrix}}{\mathop{CH_3COCl}}+\underset{\begin{smallmatrix} Hydro- \\ Chloric \\ acid \end{smallmatrix}}{\mathop{HCl}}+\underset{\begin{smallmatrix} Phosphoryl \\ chloride \end{smallmatrix}}{\mathop{POCl_3}} $