Question

The strongest conjugate base is :

• A. $N{O}_3^{-}$
• B. $C{l}^{-}$
• C. $S{O}_4^{2-}$
• D. $C{H}_{3}CO{O}^{-}$

Answer 1

The correct option is D $C{H}_{3}CO{O}^{-}$

The strongest conjugate base will be formed from the weakest acid.
Acids from which these conjugate bases are formed are:
$\left(a\right)N{O}_3^{-}fromHN{O}_3\left(b\right)C{l}^{-}fromHCl\left(c\right)S{O}_4^{2-}fromHS{O}_4^{-}\left(d\right)C{H}_{3}CO{O}^{-}fromC{H}_{3}COOH$
We see that out of the four options $C{H}_{3}COOH$ is the weakest acid and hence $C{H}_{3}CO{O}^{-}$is the strongest conjugate base.