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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
    Arrange the following alkenes in order of increasing reactivity towards anionic polymerisation \[\underset{I}{\mathop{{{H}_{2}}C=CHC{{H}_{3}},}}\,\] \[\underset{II}{\mathop{{{H}_{2}}C=C{{F}_{2}},}}\,\] \[\underset{III}{\mathop{{{H}_{2}}C=CHCN}}\,\]\[\underset{IV}{\mathop{{{H}_{2}}C=CH{{C}_{6}}{{H}_{5}}}}\,\]

    A)  I < IV < II < III                    

    B)  I < II < III < IV

    C)  III < II < I < IV                    

    D)  IV < III < II < I

    Correct Answer: A

    Solution :

                    Reactivity towards anionic polymerisation increases as the stability of the intermediate carbanion increases. \[BC{{H}_{2}}-\overline{C}H-C{{H}_{3}}<BC{{H}_{2}}-\overline{C}H-{{C}_{6}}{{H}_{5}}<BC{{H}_{2}}\]       \[-\overline{C}{{F}_{2}}<BC{{H}_{2}}-\overline{C}H-CN\] where B is any nucleophile or the base, therefore reactivity of the corresponding alkenes towards anionic polymerisation increases in the same order \[\underset{I}{\mathop{C{{H}_{2}}=CHC{{H}_{3}}}}\,<\underset{IV}{\mathop{C{{H}_{2}}=CH{{C}_{6}}{{H}_{5}}}}\,<\underset{II}{\mathop{C{{H}_{2}}=C{{F}_{2}}}}\,\] \[<\underset{III}{\mathop{C{{H}_{2}}=CHCN}}\,\]


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