A) \[O{{H}^{-}}\]
B) \[C{{H}_{3}}CO{{O}^{-}}\]
C) \[Cr\]
D) \[HCO{{O}^{-}}\]
Correct Answer: A
Solution :
\[O{{H}^{-}}\] will have the minimum value of \[_{p}{{K}_{a}}\], because it act as a strongest base.
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