The decreasing order of reactivity of the following compounds towards nucleophilic substitution (SN2) is :

Question

The decreasing order of reactivity of the following compounds towards nucleophilic substitution (S_N2) is :

(IV) > (II) > (III) > (I)

(II) > (III) > (IV) > (I)

(II) > (III) > (I) > (IV)

(III) > (II) > (IV) > (I)

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