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Question 830004
JEE Chemistry · Medium

Haloalkanes and Haloarenes: Reactivity order MCQ

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Reactivity orderMediumQuestion 830004

Question

The order of reactivity of alkyl halides toward SN2 is:
  1. A
    1° > 2° > 3°
    Correct
  2. B
    3° > 2° > 1°
  3. C
    2° > 1° > 3°
  4. D
    All equal

Correct answer

1° > 2° > 3°

Explanation

SN2 is bimolecular — steric hindrance at the reactive carbon is the key factor. Less hindered substrates react faster: primary (1°) > secondary (2°) > tertiary (3°). Methyl halide reacts fastest of all.

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