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JEE Main levelSingle correct optionDifficulty 2 of 3hc024

2-Methylpropene reacts with $HBr$ in the presence of benzoyl peroxide. The major product is

A2-bromo-2-methylpropane
B1,2-dibromo-2-methylpropane
C1-bromo-2-methylpropane
D2-methylpropane

Answer: C

Under peroxide conditions

Br \cdot

adds first to the less substituted carbon so as to form the more stable tertiary radical,

(CH X_{3}) X_{2} C \cdot - CH X_{2} Br

. Hydrogen abstraction from

HBr

then gives

(CH X_{3}) X_{2} CH - CH X_{2} Br

, 1-bromo-2-methylpropane.

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