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JEE Main levelSingle correct optionDifficulty 2 of 3o2085

In the peroxide effect, the radical chain is started by the peroxide ROOR through

Aheterolysis of the C-H bond of the alkene
Bprotonation of ROOR by HBr to give $ROOH X_{2} X^{+}$
Cheterolysis of the O-O bond to give $RO X^{+}$ and $RO X^{-}$
Dhomolysis of the weak O-O bond to give $RO \cdot$

Answer: D

The O-O bond of a peroxide is weak and breaks homolytically on heating or light to give two alkoxy radicals.

RO \cdot

then abstracts H from HBr to give

Br \cdot

, which carries the chain.

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