The main product obtained in the reaction of 2-butene with N-bromosuccinimide in presene of light is

C H_{2} B r C H B r C H_{2} C H_{3}

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C H_{3} C H B r C H_{2} C H_{3}

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C H_{3} C H = C B r C H_{3}

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C H_{3} C H = C H C H_{2} B r

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Solution

The correct option is D $C H_{3} C H = C H C H_{2} B r$
The brominating agent, N-bromosuccinimide (NBS), is used for preparation of allylic bromide. It lead to allylic substitution reaction through free-radical mechanism.
$C H_{3} C H = C H C H_{3} N B S, h v - ---- \to C H_{3} C H = C H C H_{2} B r$

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