The correct acidity order of the following is

In general, acids have greater tendency to lose  H+ compared to alcohols. Out of I and II; I is stronger acid than II due to the presence of CH3+I  effect  which makes the release of proton difficult from the latter. Out of IV and III, III is a stronger acid due to the presence of  Cl−I effect which facilitates the release of proton than by III. Hence the order of I > II > IV>IIII