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