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Question

H.V.Z reaction involves the use of P and Cl2
CH3CH2COOHP,Cl2−−CH3CHClCOOH The function of phosphorus is


A

As a catalyst

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B

In the formation of PCl3 which carries out halogenation at the α - carbon atom

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C

In the formation of PCl3 which converts - COOH into - COCl.

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D

None of the three

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Solution

The correct option is C

In the formation of PCl3 which converts - COOH into - COCl.


Phosphorus converts a little of the acid into acid chloride which is more reactive than the parent carboxylic acid. Thus is the acid chloride. not the acid itself, that undergoes chlorination on the α - carbon.


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