Arrange the following compounds in order of decreasing acidity:Phenol substituted with:

Acidity of substituted phenols is increased by electron-withdrawing groups (EWG) and decreased by electron-donating groups (EDG).$-{\text{NO}}_2$ (III): Strong EWG ($-M,-I$). Most acidic.$-\text{Cl}$ (I): EWG via $-I$ effect. More acidic than phenol.$-{\text{CH}}_3$ (II): EDG via $+I$ and hyperconjugation. Less acidic than phenol.$-{\text{OCH}}_3$ (IV): Strong EDG via $+M$ effect. Least acidic.Order: III > I > II > IV.