Which one of the following compounds is not a protonic acid?
Text Solution
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in aqueous medium coordinates a molecule of water to form the
hydrated species 
. In this species, 
ion, because of its small size, exercises a high polarizing power thereby pulling the sigma electron charge of the coordinated 
atom towards itself. The coordinated oxygen, in turn, pulls the sigma electron charge of the OH bond ofthe attached water molecule towards itself. This facilitates the removal of 
ion from the O—H bond.
Thus, the solution of 
in water acts as a weak acid, and it is not a protonic acid.
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