• # question_answer 95) The order of rate of hydrolysis of alkyl halides $1{}^\circ ,\text{ }2{}^\circ ,\text{ }3{}^\circ$ and $C{{H}_{3}}X$by the ${{S}_{N}}2$pathway is A) ${{1}^{o}}>{{2}^{o}}>{{3}^{o}}C{{H}_{3}}X$ B) $C{{H}_{3}}X>{{3}^{o}}>{{2}^{o}}>{{1}^{o}}$ C) $C{{H}_{3}}X>{{1}^{o}}>{{2}^{o}}>{{3}^{o}}$D) ${{3}^{o}}>{{2}^{o}}>{{1}^{o}}>C{{H}_{3}}X$

Solution :

${{S}_{N}}2$reaction: $N{{u}^{o-}}+R-X\xrightarrow{\text{slow}}\underset{\text{Transition}\,\text{state}}{\mathop{Nu-R-X}}\,$ $\xrightarrow{Fast}Nu-R+{{X}^{-}}$ Order of reactivity: $C{{H}_{3}}X>{{1}^{o}}>{{2}^{o}}>{{3}^{o}}.$ Hence, the correct option is [c].

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