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Acyl Substitution Revisited

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Question

By the action of $P C l_{3}$ or $P C l_{5}$ with alcohols alkyl halides and a by product $H C l$ is formed.The byproduct HCl is absorbed by using :

A

E t_{3} N, C_{5} H_{5} N

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B

E t_{2} N H, C_{5} H_{5} N

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C

E t_{N} H_{2}, C_{5} H_{5} N

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D

E t_{3} N, C_{6} H_{5} N

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Solution

The correct option is A $E t_{3} N, C_{5} H_{5} N$
By the action of $P C l_{3}$ or $P C l_{5}$ with alcohols alkyl halides and a
by product $H C l$ is formed.The byproduct $H C l$ is absorbed by using Triethyl amine( $E t_{3} N$ ),pyridine( $C_{5} H_{5} N$ ) which are bases and neutralise the acid like $H C l$ and $H B r$ etc.

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