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NEET levelSingle correct optionDifficulty 1 of 3o2064

In the peroxide-catalysed addition of HBr to an alkene, the species that first attacks the carbon-carbon double bond is

Aa proton, $H X^{+}$
Ba bromine atom, $Br \cdot$
Ca bromide ion, $Br X^{-}$
Da hydrogen atom, $H \cdot$

Answer: B

The peroxide radical

RO \cdot

abstracts H from HBr to give

Br \cdot

, which is the chain carrier. The bromine atom adds to the double bond first, forming a carbon radical.

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