Identify the major product P obtained in the following reaction.

Step-by-step solution

The given reaction is the acid-catalyzed dehydration of an alcohol, which proceeds via an E1 mechanism involving a carbocation intermediate. Protonation of the hydroxyl group followed by the loss of a water molecule generates a secondary carbocation at C1. The adjacent carbon (C2) is a quaternary carbon with two methyl groups. To achieve greater stability, a 1,2-methyl shift occurs from C2 to C1. This rearrangement converts the secondary carbocation into a more stable tertiary carbocation at C2. The rearranged tert