Among the following, the correct order of acidity is:

Acidic strength $\propto$ stability of conjugate base (Anion)

stability of conjugate base $\propto$ less charge density $\propto$ more charge delocalisation$\propto$ resonating structure



Oxidation state of chlorine $\propto$ Acidity of Oxo Acid.

$\mathrm{H}\mathrm{C}\mathrm{l}\mathrm{O}<\mathrm{H}\mathrm{C}\mathrm{l}{\mathrm{O}}_2<\mathrm{H}\mathrm{C}\mathrm{l}{\mathrm{O}}_3<\mathrm{H}\mathrm{C}\mathrm{l}{\mathrm{O}}_4$ is the correct increasing order.