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AMU Medical AMU Solved Paper-2010

  • question_answer
    When subjected to acid catalysed hydration, the order of reactivity of the alkenes; \[{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}(I),C{{H}_{3}}CH=C{{H}_{2}}(II)\] and\[C{{H}_{2}}=C{{H}_{2}}(III)\] is

    A)  III > II > I                             

    B)  I > III > II

    C)  I > II > III                             

    D)  II > I > III

    Correct Answer: C

    Solution :

                     Acid catalysed hydration of alkenes involves formation of carbocation intermediate. Higher the stability of carbocation intermediate, more is the reactivity towards acid catalyzed hydration. The order of  stability   of carbocations (formed) is \[{{(C{{H}_{3}})}_{2}}\overset{*}{\mathop{C}}\,C{{H}_{3}}>C{{H}_{3}}\overset{*}{\mathop{C}}\,HC{{H}_{3}}>\overset{*}{\mathop{C}}\,{{H}_{2}}-C{{H}_{3}}\] Thus, the order of reactivity towards acid catalysed hydration is \[\underset{(I)}{\mathop{{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}}}\,>\underset{(II)}{\mathop{C{{H}_{3}}>C{{H}_{3}}=C{{H}_{2}}}}\,>\underset{(III)}{\mathop{C{{H}_{2}}=C{{H}_{2}}}}\,\]


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