Which among the following statements is NOT correct about $\mathrm{SN}^2$ reaction mechanism?

Which among the following statements is NOT correct about $\mathrm{SN}^2$ reaction mechanism?
  1. Nucleophile attacks the atom from the side opposite to halogen.
  2. Rate of reaction is dependent on the concentration of nucleophile.
  3. Bond formation and bond breaking occurs simultaneously.
  4. $\mathrm{SN}^2$ mechanism is observed in tertiary alkyl halides.

Solution

$\mathrm{SN}^2$ mechanism is observed in primary (least steric) alkyl halides. Thus, option D is incorrect.

Asked in: MHT CET 2022 (05 Aug Shift 2)

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