A) \[{{\operatorname{NO}}_{3}}^{-}\]
B) \[{{\operatorname{Cl}}^{-}}\]
C) \[{{\operatorname{SO}}^{2-}}_{4}\]
D) \[C{{H}_{3}}CO{{O}^{-}}\]
Correct Answer: D
Solution :
Only strong conjugate has a weak conjugate acid. Hence weakest conjugate is \[{{\operatorname{CN}}_{3}} COOH.\]
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