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Question 830011
JEE Chemistry · Easy

Haloalkanes and Haloarenes: Mixed MCQ

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MixedEasyQuestion 830011

Question

The leaving group ability in SN reactions follows the order:
  1. A
    I⁻ > Br⁻ > Cl⁻ > F⁻
    Correct
  2. B
    F⁻ > Cl⁻ > Br⁻ > I⁻
  3. C
    All equal
  4. D
    Cl⁻ > Br⁻ > I⁻ > F⁻

Correct answer

I⁻ > Br⁻ > Cl⁻ > F⁻

Explanation

Leaving group ability = ability to leave as a stable anion. Better leaving groups have weaker C−X bonds and more stable anions. I⁻ is the most stable (large, polarisable) → best leaving group. F⁻ is the worst leaving group despite F being most electronegative (C−F bond is very strong).

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