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2 methylbutane on reacting with bromine in the presence of sunlight gives mainly

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

Correct answer: 2 - bromo - 2 - methylbutane

Solution

2-methylbutane, (CH3)2CH-CH2-CH3, has a tertiary hydrogen at C2. Because bromination strongly favors the tertiary position, the main product is 2-bromo-2-methylbutane.

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