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HBr reacts fastest with

1. 2-Methylpropan-1-ol
2. 2-Methylpropan-2-ol
3. propan-2-ol
4. propan-1-ol

Correct answer: 2-Methylpropan-2-ol

Solution

HBr reacts fastest with 2-Methylpropan-2-ol because it forms a tertiary carbocation during the reaction, which is the most stable and facilitates the reaction rate.

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