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JEE Main & Advanced JEE Main Solved Paper-2017

  • question_answer
    The increasing order of the reactivity of the following halides for the \[{{\text{S}}_{\text{N}}}\text{1}\]reaction is [JEE Main 2017]  \[\text{C}{{\text{H}}_{\text{3}}}\underset{\text{Cl}}{\mathop{\underset{\text{ }\!\!|\!\!\text{ }}{\mathop{\text{C}}}\,}}\,\text{HC}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{3}}}\]                \[\text{C}{{\text{H}}_{\text{3}}}\text{C}{{\text{H}}_{\text{2}}}\text{C}{{\text{H}}_{\text{2}}}\text{Cl}\]  \[p-{{H}_{3}}CO-{{C}_{6}}{{H}_{4}}-C{{H}_{2}}Cl\]     JEE Main Solved Paper-2017

    A)  (III) < (II) < (I)   

    B)  (II) < (I) < (III)

    C)  < (III) < (II)        

    D)  (II) < (III) < (I)

    Correct Answer: B

    Solution :

     For any \[{{\text{S}}_{\text{N}}}\text{1}\]reaction reactivity is decided by ease of dissociation of alkyl halide \[R-X{{R}^{\oplus }}+{{X}^{\oplus }}\] Higher the stability of \[{{R}^{\oplus }}\](carbocation) higher would be reactivity of \[{{\text{S}}_{\text{N}}}\text{1}\]reaction. Since stability of cation follows order. \[C{{H}_{3}}-C{{H}_{2}}-\underset{\oplus }{\overset{\oplus }{\mathop{C}}}\,{{H}_{2}}\] \[<C{{H}_{3}}-\overset{\oplus }{\mathop{C}}\,H-C{{H}_{2}}-C{{H}_{3}}\] \[<p-{{H}_{3}}CO-{{C}_{6}}{{H}_{4}}-\overset{\oplus }{\mathop{C}}\,{{H}_{2}}\] Hence correct order is \[\]


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