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NEET2018ChemistryHaloalkanes and HaloarenesActual

The decreasing order of S _ N 2 reaction for the given compounds is

Options

  1. AI > II > III > IV
  2. BII > I > III > IV
  3. CIV > III > II > I
  4. DIV > III > I > II

Correct answer

B. II > I > III > IV

Step-by-step solution

Rate of S _ N 2 reaction -I -effect, -M -effect 1 steric crowding I. CH ₃- CH ₂- CH ₂- Cl II. Ph - CH ₂- CH ₂- Cl Thus, rate of S _ N 2 reaction is II > I > III > IV

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