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JEE Main2007ChemistryHaloalkanes and HaloarenesActual

Which of the following is the correct order of decreasing SN ^2 reactivity?

Options

  1. ARCH ₂ X > R ₃ CX > R ₂ CHX
  2. BRCH ₂ X > R ₂ CHX > R ₃ CX
  3. CR ₃ CX > R ₂ CHX > RCH ₂ X
  4. DR ₂ CHX > R ₃ CX > RCH ₂ X ( X = a halogen )

Correct answer

B. RCH ₂ X > R ₂ CHX > R ₃ CX

Step-by-step solution

More is the steric hindrance at the carbon bearing the halogen, lesser is the S _ N 2 reactivity. Hence, (B) is correct.

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