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JEE Main levelSingle correct optionDifficulty 2 of 3o2081

Styrene, $C X_{6} H X_{5} CH = CH X_{2}$ , reacts with HBr in the presence of a peroxide. The major product is

A $C X_{6} H X_{5} CH X_{2} CH X_{3}$
B $C X_{6} H X_{5} CHBrCH X_{3}$
C $C X_{6} H X_{5} CHBrCH X_{2} Br$
D $C X_{6} H X_{5} CH X_{2} CH X_{2} Br$

Answer: D

Br \cdot

adds to the terminal carbon, giving the benzylic radical

C X_{6} H X_{5} CH \cdot CH X_{2} Br

stabilised by resonance with the ring. H abstraction from HBr then gives (2-bromoethyl)benzene.

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