MDCAT Chemistry MCQ #622

Comparing ethyl fluoride, ethyl chloride, ethyl bromide, and ethyl iodide, which compound reacts fastest in nucleophilic substitution and what is the reason?

MDCAT Chemistry MCQ #622

  1. Question 1

    Q1. Comparing ethyl fluoride, ethyl chloride, ethyl bromide, and ethyl iodide, which compound reacts fastest in nucleophilic substitution and what is the reason?

    • A) Ethyl iodide because it has the lowest bond dissociation energy.
    • B) Ethyl fluoride because it has the highest bond polarity.
    • C) Ethyl chloride because it has the smallest steric hindrance.
    • D) Ethyl bromide because it has moderate electronegativity difference.

    Answer: Ethyl iodide because it has the lowest bond dissociation energy.

    Explanation: Iodoalkanes are most reactive because the C-I bond is the weakest, despite C-F being the most polar bond in the series.