The correct order of acidic strength of the following compounds is
HClO > HClO2 > HClO3 > HClO4
HClO4 > HClO3 > HClO2 > HClO
HClO2 > HClO > HClO3 > HClO4
HClO4 > HClO2 > HClO3 > HClO
Acidic nature of oxyacids increases with increasing oxidation state of chlorine : HClO < HClO2 < HClO3 < HClO4.