Answer :

The first step in the mechanism of the given reaction is protonation of the alcohol followed by loss of water to give a 20 carbocation.

The next step is a rearrangement of the 20 carbocations formed in the above step is less stable it rearranges by a 1,2-hydride shift to form more stable 3° carbocations.

The last step of the reaction is the nucleophilic attack of Br- ion on the 3° carbocations giving the final product.

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