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JEE Main levelSingle correct optionDifficulty 2 of 3o2187

3-Methylbut-1-ene reacts with $HBr$ in the presence of peroxide. The major product is

A1-bromo-3-methylbutane
B2-bromo-3-methylbutane
C2-bromo-2-methylbutane
D1-bromo-2-methylbutane

Answer: A

In the presence of peroxide,

Br \cdot

adds to the terminal carbon to give the more stable secondary radical. This radical abstracts H from HBr and does not rearrange. The product is

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

.

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