Q.

The best reagent for the preparation of pure C2H5Cl from ethanol is

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a

Lucas reagent 

b

Thionyl chloride in Pyridine

c

PCl5

d

Red Phosphorous + Chlorine

answer is C.

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Detailed Solution

Thionyl chloride is preferred in the preparation of chloro alkanes because the by poroducts of the reaction i.e. SO2 and HCl are gases and escape into the atmosphere leaving behind alkyl chlorides in almost pure form.

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