Question

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

• A. $B(OH{)}_3$
• B. $PO(OH{)}_3$
• C. $SO(OH{)}_2$
• D. $S{O}_2(OH{)}_2$

Answer 1

The correct option is A $B(OH{)}_3$

The acid which gives $H^{+}$ when placed in aqueous solution is called Protonic acid.

Ortho boric acid does not donate proton like most of the acids but rather it accepts $O{H}^{-}$ therefore it is a lewis acid.

$B(OH{)}_3+2H_{2}O\leftrightharpoons H_3{O}^{+}+[B(OH{)}_4{]}^{-}$