The $O H$ group of an alcohol or the carboxylic acid can be replaced by $C l$ , using:

hypochlorous acid

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chlorine

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hydrochloric acid

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phosphorous pentachloride

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Solution

The correct option is D phosphorous pentachloride
In the given options ${O H}^{-}$ group is replaced by phosphorous pentachloride.
$R - C O O H + P {C l}_{5} ⟶ R - C O C l + P O {C l}_{3} + H C l$
$3 R - C O O H + P {C l}_{3} ⟶ 3 R - C O C l + H_{3} P O_{3}$
$R - C O O H + S O {C l}_{2} ⟶ R - C O C l + S O_{2} + H C l$
Phosphorous pentachloride, phosphorous trichloride and thienyl chloride can replace $O H$ group.

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