The reaction is fastest when X is

The reaction
is fastest when X is
  1. Cl
  2. $\mathrm{NH}_2$
  3. $\mathrm{OC}_2 \mathrm{H}_5$
  4. OCOR

Solution

Conjugated acid of $\mathrm{Cl}^{-}$is a stronger acid i.e. $\mathrm{HCl}$.

Asked in: JEE Main 2005

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