MDCAT Chemistry MCQ #5095

A chemist observes a three-step reaction mechanism for the synthesis of a complex molecule. Which step dictates the overall rate of the reaction?

MDCAT Chemistry MCQ #5095

  1. Question 1

    Q1. A chemist observes a three-step reaction mechanism for the synthesis of a complex molecule. Which step dictates the overall rate of the reaction?

    • A) The fastest elementary step
    • B) The slowest elementary step
    • C) The step with the lowest activation energy
    • D) The step involving the most stable intermediate

    Answer: The slowest elementary step

    Explanation: The slowest step in a multi-step reaction is the rate-determining step. Option A is tempting but fast steps don't limit overall speed.