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