Arrange the following in the correct order of their reactivity towards nucleophilic addition reactions

The reactivity of a substrate towards nucleophilic addition reactions depends on the groups attached to the carbonyl carbon that affect the charge density on it. III is most reactive due to absence of electron-donating $-\mathrm{CH}_3$ groups that are present on other compounds. II is least reactive due $-\mathrm{CH}_3$ and $-\mathrm{NH}_2$ that greatly increase the charge density on carbonyl carbon, making it least prone to nucleophilic attack. Among $\mathrm{I}$ and IV, I is more reactive due to only one $-\mathrm{CH}_3$ group. Thus, the order will be III $>$ I $>$ IV $>$ II.