Among the following, the correct order of acidity is
The acidic character of the oxoacids increases with increase in oxidation number of the halogen atom i.e., HClO<HClO2<HClO3<HClO4. The can be explained on the basis of relative stability of the anions left after removal of a proton. Stability of the anions left after removal of a proton. Since the stability of the anion decreases in the order : ClO4−>ClO3−>ClO2−>ClO−, acid strength also decrease in the same order.