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BITSAT2024ChemistryHaloalkanes and HaloarenesActual

In S _ N 2 substitution reaction of the type R- Br + Cl ⁻ [ BMF ] R- Cl + Br ⁻ Which one of the following has highest relative rate?

Options

  1. ACH ₃ CH ₂ Br
  2. BCH ₃ CH ₂ CH ₂ Br

Correct answer

2

Step-by-step solution

The rate of S_n 2 reaction is the maximum with 1^ allyl halide having least steric hindrance. Out of CH ₃ CH ₂ Br and CH ₃ CH ₂ CH ₂ Br , CH ₃ CH ₂ Br has the least steric hindrance and hence has the highest relative rate.

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