A) \[SO{{(OH)}_{2}}\]
B) \[S{{O}_{2}}{{(OH)}_{2}}\]
C) \[B{{(OH)}_{3}}\]
D) \[PO{{(OH)}_{3}}\]
Correct Answer: C
Solution :
\[B{{(OH)}_{3}}\] is not a protonic acid because it does not give proton on ionisation directly while it acts as Lewis acid due to acceptance of \[O{{H}^{-}}\]from water and forms a hydrated species. \[B{{(OH)}_{3}}+{{H}_{2}}O\xrightarrow{{}}[B{{(OH)}_{4}}]+{{H}^{+}}\]
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