Order of oxidizing power is hclo>hclo2>hclo3>hclo4 but order of strenght oxidizing agent is hclo4>hclo3>hclo2>hclo
Why is it so?

The oxiding power of HClO4, HClO3, HCLO2, HClO are in the following order: HClO >HCLO2 >HClO3>HClO4 because the oxidizing power of oxyacids of chlorine is inversely related to the thermal stability of these acids i.e. higher the thermal stability, lower will be oxidizing power of the oxyacid and vice versa.

 

Hope you understand