NEET Sample Paper NEET Sample Test Paper-14

  • 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) \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}>C{{H}_{3}}X\]

    Correct Answer: C

    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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