MCQ
The reaction, is fastest when $X$ is


- ✓$Cl$
- B$N{H_2}$
- C$O{C_2}{H_5}$
- D$OCOR$

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. . . . . (Given that the value of solubility product of $A B \left( K _{ sp }\right)=2 \times 10^{-10}$ and the value of ionization constant of $H B \left( K _{ a }\right)=1 \times 10^{-8}$ )