MDCAT Chemistry MCQ #615

In a substitution reaction, the iodide ion (I-) is a better nucleophile than the fluoride ion (F-) in protic solvents. What factor explains this?

MDCAT Chemistry MCQ #615

  1. Question 1

    Q1. In a substitution reaction, the iodide ion (I-) is a better nucleophile than the fluoride ion (F-) in protic solvents. What factor explains this?

    • A) Electronegativity
    • B) Polarizability
    • C) Solvation energy
    • D) Atomic mass

    Answer: Polarizability

    Explanation: Larger ions like iodide are more polarizable and less tightly solvated in protic solvents; electronegativity is tempting but follows the opposite trend.