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CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    The order of reactivities of the following alkyl halides for a \[{{S}_{N}}2\]reaction is

    A)  \[RF>RCl>RBr>RI\]

    B)  \[RF>RBr>RCl>RI\]

    C)  \[RCl>RBr>RF>RI\]

    D)  \[RI>RBr>RCl>RF\]

    E)  None of the above

    Correct Answer: D

    Solution :

                    The reactivity order of alkyl halide is\[R-I>R-Br>R-Cl>R-F\] This order is due to the bond dissociation enthalpy i.e. the energy required to cleave the\[C-X\] bond. Lesser the bond dissociation energy, more will be the reactivity of the haloalkanes.


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