Which one of the following compounds is not a protoric acid?

Options

A. `SO(OH)_(2)`
B. `SO_(2)(OH)_(2)`
C. `B(OH)_(2)`
D. `PO(OH)_(3)`

Answer

C

Explanation

`Ba(OH)_(3)` is not protonic acid because it does not give proton on ionisation directly. While it acts as Lewis acid due to acceptance of `OH^(-)` form water and forms a hydrated species.
`B(OH)_(3)+H_(2)O rarr [B(OH)_(4)]^(-)H^(+)`.