CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    Which alkyl halide is most reactive towards\[{{S}_{N}}1\] mechanism?

    A)  \[{{(C{{H}_{3}})}_{3}}C\cdot Cl\]             

    B)  \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Cl\]

    C)  \[C{{H}_{3}}C{{H}_{2}}Cl\]                          

    D)  \[C{{H}_{3}}Cl\]

    E)  None of these

    Correct Answer: A

    Solution :

                    The order of reactivity of\[{{S}_{N}}1\]reaction depends upon the stability of carbocation in the first step. Greater the stability of the carbocation, greater will be the ease of formation and hence faster will be the rate of reaction. The order of reactivity will be \[3{}^\circ \]alkyl halide > \[2{}^\circ \]alkyl halide > \[1{}^\circ \]alkyl halide > methyl halide Hence,\[{{(C{{H}_{3}})}_{3}}Cl\cdot Cl\]is most reactive towards\[{{S}_{N}}1\]mechanism.


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