question_answer

Arrange the following halides in order of increasing \[{{S}_{{{N}^{2}}}}\] reactivity: \[C{{H}_{3}}Cl,\,C{{H}_{3}}Br,\,C{{H}_{3}}C{{H}_{2}}C{{l}_{2}},\]\[{{(C{{H}_{3}})}_{2}}CHCl\].

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: \[{{(C{{H}_{3}})}_{2}}CHCl<C{{H}_{3}}C{{H}_{2}}Cl<C{{H}_{3}}Cl<C{{H}_{3}}Br\].