Arrange the following compounds in order of decreasing acidity:

electron withdrawing group will increase the acidic strength of phenol as they stabilize the phenoxide ion whereas electron donating group will decrease the stability of phenoxide therefore decrease the acidic strength of the phenols$\text{ Correct order of acidic strength is }\mathrm{III}>\mathrm{I}>\mathrm{II}>\mathrm{IV}$