Answer:
Presence
of electron-withdrawing groups at o- and 77-positions w.r.t. halogen increases
the reactivity of halogens towards nucleophilic substitution reactions due to
the stability of the intermediate carbanion.
Obviously more the number of such groups at o- and p-positions, w.r.t.
halogen, higher is the reactivity.
Thus, the reactivity of the given aryl halides decreases in the order :
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