First slide

Oxoacids of Halogens

Question

Among the following, the correct order of acidity is

Easy

A

${HClO}_{2} < HClO < {HClO}_{3} < {HClO}_{4}$
B

${HClO}_{4} < {HClO}_{2} < HClO < {HClO}_{3}$
C

${HClO}_{3} < {HClO}_{4} < {HClO}_{2} < HClO$
D

$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$

Solution

The acidic character of the oxoacids increases with increase in oxidation number of the halogen atom i.e.,
$HClO < {HClO}_{2} < {HClO}_{3} < {HClO}_{4}$
This can be explained on the basis of relative stability of the anions left after removal of a proton. Since the stability of the anion decreases in the order : ${ClO}_{4}^{-} > {ClO}_{3}^{-} > {ClO}_{2}^{-} > {ClO}^{-}$
Acid strength also Decreases in the same order

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