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Since 2-methylpropan-2-ol generates 3° carbocation, therefore, it reacts fastest with HBr.

1. Greater the stability of the intermediate carbocation, more reactive is the alcohol.
2. 2-methylpropan-2-ol generates a 3° carbocation.
3. Alcohols react with HBr to form alkyl bromides.
4. The reaction is fastest for tertiary alcohols.

Correct answer: Greater the stability of the intermediate carbocation, more reactive is the alcohol.

Solution

The reactivity of alcohols with HBr depends on the stability of the carbocation intermediate formed during the reaction. Tertiary alcohols like 2-methylpropan-2-ol form the most stable carbocation, making them react fastest.

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