The correct order of relative acidity is (UP CPMT 2013)

Acidic strength of oxyacids increases with increases with increase in oxidation state in central atom. Find the oxidation state of chlorine in all the oxyacids to decide the decreasing acidic strength order among oxyacids. (i) HClO₄ = + 1 + x + (– 2 x 4) = 0 x = +7 (ii) HClO₃ = +1 + x + (– 2 x 3) = 0 x = + 5 (iii) HClO₂ = 1 + x + (–2 x 2) = 0 x = + 3 (iv) HClO = +1 + x + (– 2 x 1) = 0 x = + 1 HClO₄ is the strongest acid and HClO is the weakest acid. Correct order of acidic strength is HClO₄> HClO₃ > HClO₂ > HClO