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NEET Chemistry NEET PYQ-IUPAC and Isomerism

  • question_answer
    Among the following alkenes,        [AIPMT 2000] 1-butene       cis-2-butene      trans-2-2butene        I                      II                          III the decreasing order of stability is:

    A)                                                                              II > I > III

    B) III > II > I

    C) III > I > II

    D) I > II > III

    Correct Answer: B

    Solution :

    [b] Stability of an alkene depends upon the heat of hydrogenation of an alkene. The lower the heat of hydrogenation of an alkene higher will   be stability. Order of stability trans-2-butene > cis-2-butene > 1-butene. Heat of hydrogenation (kJ/mol) are 115.5, 119.6 and 126.8 respectively.


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