The correct order of reactivity for reactions involving cleavage of $\mathrm{C}-\mathrm{X}$ bond in…

The correct order of reactivity for reactions involving cleavage of $\mathrm{C}-\mathrm{X}$ bond in following compounds is
  1. I>III>II
  2. III>II>I
  3. I>II>III
  4. II>III>I

Solution

Cleavage of $\mathrm{C}-\mathrm{X}$ bond occurred by $\mathrm{Ar}-\mathrm{SN}$ reaction. Rate of $\mathrm{Ar}-\mathrm{SN} \propto-\mathrm{M},-\mathrm{I} \propto \frac{1}{+\mathrm{M}+\mathrm{I}}$

Asked in: MHT CET 2022 (08 Aug Shift 1)

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