When 3-methyl-2-butanol reacts with HBr, 2-bromo-2-methylbutane is obtained as the only product. Why?

Explanation

In this reaction , a`2^(@)` carboncation is formed as an intermediate. Since `2^(@)` carbocation is less stable than `3^(@)` carbocation the `2^(@)` carbocation undergoes 2,3-hydride shift to produce `3^(@)` carbocation. Now `Br^(Theta)` ion (nucleophile) attacks the electrophilic centre of the `3^(@)` carbocation to produce 2-bromo-2-methybutane.