A) \[C{{l}^{-}}\]
B) \[B{{r}^{-}}\]
C) \[{{F}^{-}}\]
D) \[{{I}^{-}}\]
Correct Answer: C
Solution :
Key Idea: 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).
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