Question

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

• A. $SO_2(OH)_2$
• B. $B(OH)_3$
• C. $PO(OH)_3$
• D. $SO(OH)_2$

Answer 1

Answer: (B)

$B(OH)_3$

Answer 2

$B(OH)_{3}$ in water gives $H^{+}$ ions as follows $B(OH)_{3}+H_{2}O {<=>} [B(OH)^{-}_{4}]+H^{+}$ Thus, it is not a protonic acid i.e., it does not give its hydrogen $H^{+}$ ions