Question

Strongest conjugate base is :

• A. $C{l}^{-}$
• B. $B{r}^{-}$
• C. $F^{-}$
• D. $I^{-}$

Answer 1

Answer: (C)

Weakest acid has strongest conjugate base
(The conjugate acid and base differ by $H^{+}$ion).
$\because HF$ is weakest acid due to its maximum bond strength.
$\therefore F^{-}$is strongest base
( $\because$ it is conjugate base of weakest acid HF).