Which of the following is the strongest conjugate base ?

Options

A. `Cl^(-)`
B. `CH_(3)COO^(-)`
C. `SO_(4)^(--)`
D. `NO_(2)^(-)`

Answer

B

Explanation

Because it is conjugate base of weak acid
`CH_(3)COOH hArr CH_(3)COO^(-) +H^(+)`