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VIT Engineering VIT Engineering Solved Paper-2009

  • question_answer
    Given that \[Alkyne\xrightarrow[Lindlars\,\,catalyst]{{{H}_{2}}}A\xrightarrow{Ozonolysis}\underset{only}{\mathop{B}}\,\], express the \[\xleftarrow[\Pr ocess]{Wac\ker }C{{H}_{2}}=C{{H}_{2}}\] bond energy in kcal/mol.

    A)  \[{{H}_{3}}C-C\equiv C-C{{H}_{3}}\]           

    B)  \[{{H}_{3}}C-C{{H}_{2}}-C\equiv CH\]

    C)  \[{{H}_{2}}C=CH-C\equiv CH\]            

    D)  \[HC\equiv C-C{{H}_{2}}-C\equiv CH\]

    Correct Answer: C

    Solution :

     Given: \[p\pi .d\pi \] ie,    \[Xe{{O}_{3}}\] \[Xe{{O}_{4}}\] or    \[3:5\] \[\Delta {{H}_{f}}(H)=218kJ/mol\] \[H-H\] Thus, \[52.15\]energy is absorbed for breaking one mole of \[911\] bonds. Hence, \[104\] bond energy is 104.3 kcal/mol.


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