What is (are) the elimination product(s) of the following reaction?

Question

Quizplus · Accepted Answer

The reaction involves an E1 elimination of a tertiary alcohol, which means that the leaving group (OH) leaves first to form a carbocation intermediate. Then, one of the beta carbons (marked with asterisks) undergoes deprotonation by a base to form a double bond, resulting in the elimination of H2O. This process can occur in two different ways, leading to two different products: II and III. Product I is not formed because the beta carbon adjacent to the leaving group is a primary carbon, which is not likely to form a stable carbocation intermediate. Therefore, the correct answer is D, II and III.

What Is (Are) the Elimination Product(s) of the Following Reaction