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NEET2019ChemistryHaloalkanes and HaloarenesActual

Correct order of S _ N 2 reaction is

Options

  1. Aiii > i > ii
  2. Biii > ii > i
  3. Ci > iii > ii
  4. Di > ii > iii

Correct answer

D. i > ii > iii

Step-by-step solution

For S _ N 2 reaction, the order of reactivity is methyl halide >1^ halide >2^ halide >3^ halide. Primary allylic and primary benzylic halides may react predominantly either by S _ N 1 or S _ N 2 mechanism.

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