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JEE Main levelSingle correct optionDifficulty 2 of 3o2026

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

A2-bromo-1-methylpropane
B2-bromo-2-methylpropane
C1,2-dibromo-2-methylpropane
D1-bromo-2-methylpropane

Answer: D

Br \cdot

attacks the terminal

CH X_{2}

, producing the more stable tertiary radical

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

. H abstraction from HBr gives

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

, 1-bromo-2-methylpropane.

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