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Q.

Which will undergo SN2 reaction, fastest among the following halogen compounds

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a

CH3CH2F

b

CH3CH2Cl

c

CH3CH2Br

d

CH3CH2I

answer is D.

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Detailed Solution

  • This reactivity order reflects both the strength of the C–X bond, and the stability of X- as a leaving group.
  • Thus, for a given alkyl group, the reactivity of the halide, R-X, follows the same order in both SN1 & SN2 mechanisms as follows: R–I > R–Br > R–Cl >> R–F.
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