Answer
The proposed mechanism is shown in the picture below.
Work Step by Step
The proposed mechanism is:
Step 1: Protonation of the double bond forms a carbocation.
Step 2: The pi electrons in the double bond attack on the carbocation.
Step 3: A base (nucleophile) attacks the hydrogen on the carbon adjacent to the carbocation. Then the electrons go to the C-C bond, forming a C=C.
