MDCAT Chemistry MCQ #630

Comparing the energy profile diagrams of SN1 and SN2 reactions, what is the fundamental difference regarding the number of transition states?

MDCAT Chemistry MCQ #630

  1. Question 1

    Q1. Comparing the energy profile diagrams of SN1 and SN2 reactions, what is the fundamental difference regarding the number of transition states?

    • A) SN1 has two energy peaks; SN2 has one energy peak.
    • B) SN1 has one energy peak; SN2 has two energy peaks.
    • C) Both SN1 and SN2 have two energy peaks in their profiles.
    • D) Both SN1 and SN2 have one energy peak in their profiles.

    Answer: SN1 has two energy peaks; SN2 has one energy peak.

    Explanation: SN2 occurs in one step via a single transition state, whereas SN1 occurs in two steps with a distinct carbocation intermediate.