The best method of preparation of alkyl halides is:

R O H + H C l

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R O H + P C l_{5}

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R O H + S O C l_{2}

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R O H + P C l_{3}

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Solution

The correct option is C $R O H + S O C l_{2}$
The reaction:
$R O H + S O C l_{2}$ $P y r i d i n e - ---- \to R C l + S O_{2} + H C l$
is the best method because the byproducts are all volatile gaseous molecules and easily escapes from the reaction mixture. So, no further seperation needed in this method. It is, in presence of pyridine as a base, follows $S_{N} 2$ pathway.
Hence, (c) is correct.

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