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Question

Which of the following reacts fastest with N-bromo succinimide ?

A
C6H6
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B
CH4
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C
Pyridine
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D
Toluene
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Solution

The correct option is D Toluene
NBS reacts fastest with allylic/benzyl hydrogens, i.e., toluene which contains benzylic hydrogens.

C6H5CH3NBS,hν orΔ−−−−−−−C6H5CH2Br+HBr
Toluene Benzyl bromide

Option D is correct.

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