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  4. Assertion: Styrene on reaction with HBr gives 1-bromo-1-phenylethane. Reason: Benzyl radical is more stable than alkyl radical.

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Q. Assertion : Styrene on reaction with $HBr$ gives 1-bromo-1-phenylethane.
Reason : Benzyl radical is more stable than alkyl radical.

AIIMSAIIMS 2004

Solution:

Styrene with $HBr$, undergo nucleophilic addition reaction.
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This does not involve free radical mechanism. It is also true that benzyl radical is more stable then alkyl radical.