Answer:
The reactivity of alkyl halides towards \[{{S}_{{{N}^{2}}}}\] reaction decreases (i) with the increase in the size of alkyl group (ii) in the order \[C-I>C-Br>C-Cl\].
Therefore, the increasing order of the reactivity of the listed alkyl halides is:
\[{{(C{{H}_{3}})}_{2}}CHCl<C{{H}_{3}}C{{H}_{2}}Cl<C{{H}_{3}}Cl<C{{H}_{3}}Br\].
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