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When 2-methylbutane is treated with bromine under sunlight, the principal product formed is

1. 1-bromo-3-methylbutane
2. 2-bromo-3-methylbutane
3. 2-bromo-2-methylbutane
4. 1-bromo-2-methylbutane

Correct answer: 2-bromo-2-methylbutane

Solution

The correct option is 2-bromo-2-methylbutane because the reaction involves free radical bromination, which favors the formation of the most stable radical. In this case, the tertiary radical formed at the second carbon is more stable than any secondary or primary radicals, leading to the predominant formation of the product.

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