MDCAT Chemistry MCQ #982

What role do unpaired electrons play in a free radical substitution mechanism?

MDCAT Chemistry MCQ #982

  1. Question 1

    Q1. What role do unpaired electrons play in a free radical substitution mechanism?

    • A) They stabilize the transition state through resonance
    • B) They initiate chain propagation by abstracting hydrogen atoms
    • C) They increase activation energy by repelling reactants
    • D) They determine the overall stoichiometry of the reaction

    Answer: They initiate chain propagation by abstracting hydrogen atoms

    Explanation: Unpaired electrons in radicals drive chain propagation. Transition state stabilization and activation energy are unrelated to radical initiation.