Question

The increasing order of base strength of $C{l}^{-}$$C{H}_{3}CO{O}^{-}$, ${}^{-}OH$ and $F^{-}$ is

• A. $C{l}^{-}<F^{-}<C{H}_{3}CO{O}^{-}{<}^{-}OH$
• B. $C{l}^{-}>F^{-}>C{H}_{3}CO{O}^{-}{>}^{-}OH$
• C. $C{H}_{3}CO{O}^{-}<C{l}^{-}<F^{-}{<}^{-}OH$
• D. None of these

Answer 1

The correct option is A $C{l}^{-}<F^{-}<C{H}_{3}CO{O}^{-}{<}^{-}OH$

The general rule is that the stronger an acid is, the weaker its conjugate base is. Because $HF$ is the weakest acid in the halogen series, its conjugate base $F^{-}$ will be the stronger base than $C{l}^{-}$. Acetic acid is a weak acid and Water is almost neutral therefore $O{H}^{-}$ is strongest base. The order of base strength is $C{l}^{-}<F^{-}<CH3CO{O}^{-}{<}^{-}OH$