Why does the E2 mechanism require an antiperiplanar relationship between the leaving group X and the â hydrogen?

Question

Quizplus · Accepted Answer

The antiperiplanar conformation allows for maximum overlap between the C-H ó orbital and the C-X ó* orbital, leading to the highest energy transition state and most efficient removal of the leaving group X. This is known as the "degeneracy" of the H-X ó and H-C ó* orbitals, which must align in order for the reaction to occur. Other factors such as steric hindrance may also play a role, but the primary reason for the antiperiplanar relationship is orbital overlap.

Why Does the E2 Mechanism Require an Antiperiplanar Relationship Between