MDCAT Chemistry MCQ #656

In nucleophilic substitution reactions, what is the correct order of the leaving group ability for the halide ions?

MDCAT Chemistry MCQ #656

  1. Question 1

    Q1. In nucleophilic substitution reactions, what is the correct order of the leaving group ability for the halide ions?

    • A) I- > Br- > Cl-
    • B) Cl- > Br- > I-
    • C) Br- > I- > Cl-
    • D) Cl- > I- > Br-

    Answer: I- > Br- > Cl-

    Explanation: Iodide is the best leaving group because it is a weak base and has a long, weak bond; chloride is wrong because it is less stable.