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Assertion : Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.
Reason : Phosphorus chlorides give in pure alkyl halides.
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Reason : Phosphorus chlorides give in pure alkyl halides.
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Thionyl chloride is preferred over $\mathrm{PCl}_3$ and $\mathrm{PCl}_5$ for the preparation of alkyl chlorides from alcohols because Thionyl chloride gives pure alkyl halide as other two products $\left(\mathrm{SO}_2+\mathrm{HCl}\right)$ are escapable gases.
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