Which of the following analytical statements rigorously define the mechanistic and stereochemical as — Haloalkanes and Haloarenes Chemistry Question

💡 Solution & Explanation

All statements accurately describe the E2 mechanism. It is fundamentally bimolecular and concerted, bypassing any carbocation formation (A, C). The transition state requires the developing pi-bond orbitals to overlap efficiently, which is only optimally achieved when the C-H and C-X bonds are $180^\circ$ anti-periplanar (B). Because the C-H bond is actively and directly broken during the rate-determining transition state, replacing H with D significantly elevates the activation energy, proving a primary kinetic isotope effect (D).