Which one of the following reagent is used for the preparation of allylic halide?

NBS

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Sulphonyl chloride

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Phosphorous pentachloride

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Phosphorous trichloride

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Solution

The correct option is A NBS
The brominating agent, N-bromosuccinimide (NBS), is used for preparation of allylic bromide. It lead to allylic substitution reaction through free-radical mechanism.
$S O C l_{2}, P C l_{3} and P C l_{5}$ are used to convert alcohol to alkyl halide but it does not give allylic halides.
Thus, option (a) is correct

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