The correct order of following compounds for increasing reactivity towards electrophilic substitution is:

Here $-OC{H}_3$ and $-C{H}_3$ are activating groups, that are promoting electrophilic substitution reactions. $C{F}_3$ is a deactivating group, which has the opposite effect. Hence, the order of increasing reactivity towards electrophilic substitution reaction is:

$IV<II<I<III$