Haryana PMT Haryana PMT Solved Paper-2005

  • question_answer
    Which of the following has the smallest heat of hydrogenation per mole?

    A)  1-butene     

    B)  trans-2-butene

    C)  cis-2-butene  

    D)  1,3-butadiene

    Correct Answer: B

    Solution :

                    1,3-butadiene has two double bonds, hence has   high   heat   of  hydrogenation. Trans -2-butene is the most stable alkene among three alkene, hence has lowest heat of hydrogenation.


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