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

Equilibrium

Solution:

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