Q. Which one of the following compounds, is not a protonic acid?
A) $SO(OH)_{2}$
B) $SO_{2}(OH)_{2}$
C) $B(OH)_{3}$
D) $PO(OH)_{3}$
Explanation
(c)
$B(OH)_{3}$ is not protonic acid because it does not give proton on ionisation directly while it acts as Lewis acid due to a acceptance of $OH^{-}$from water and forms a hydrated species.
$B(OH)_{3} + H_{2}O \rightarrow \left\lbrack B(OH)_{4} \right\rbrack^{-} + H^{+}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.