JIPMER Jipmer Medical Solved Paper-2015

  • question_answer
    The correct increasing order of the reactivity of halides for\[{{S}_{N}}1\]reaction is:

    A)  \[C{{H}_{3}}-C{{H}_{2}}-X<{{(C{{H}_{3}})}_{2}}CH-X<C{{H}_{2}}\]            \[=CH-C{{H}_{2}}-X<PhC{{H}_{2}}-X\]

    B)     \[{{(C{{H}_{3}})}_{2}}CH-X<C{{H}_{3}}-C{{H}_{2}}-X<C{{H}_{2}}\]             \[=CH-C{{H}_{2}}-X<PhC{{H}_{2}}-X\]

    C)     \[PhC{{H}_{2}}-X<{{(C{{H}_{3}})}_{2}}CH-X<C{{H}_{3}}\] \[-C{{H}_{2}}-X<C{{H}_{2}}=CH-C{{H}_{2}}-X\]

    D)     \[C{{H}_{3}}=CH-C{{H}_{2}}-X<Ph-C{{H}_{2}}-X<\]      \[{{(C{{H}_{3}})}_{2}}CH-X<C{{H}_{3}}-C{{H}_{2}}-X\]

    Correct Answer: A

    Solution :

    Reactivity of halides towards \[{{S}_{N}}1\] mechanism is benzyl > ally\[l>3{}^\circ >2{}^\circ >1{}^\circ .\]


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