Doubt on Role of NBS

#1

Question no 21.

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#2

Ans?

#3

Ans is 'b"

#4

NBS is used as bromination at allylic position if it is used with heat or light. But when it is used in aqueous medium it is used to halohydrin formation with stereospecific only trans product. Hence it is B .

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#5

Got it .thanks....