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    Why are the enthalpies of hydrogenation of cyclohexa-1,4-diene and cyclohexa-1,3-diene different? (sorry the title's wrong)
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    (Original post by Lilfreckles541)
    Why are the enthalpies of hydrogenation of cyclohexa-1,4-diene and cyclohexa-1,3-diene different?
    The bonding in the 1,3-diene is conjugated, meaning that the pi orbitals can overlap forming delocalised molecular orbitals, reducing the energy of the molecule.

    This means, in turn, that less energy is released on hydrogenation, as the molecule is already in a lower energy state.

    P.S. Your title is incorrect
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    (Original post by charco)
    The bonding in the 1,3-diene is conjugated, meaning that the pi orbitals can overlap forming delocalised molecular orbitals, reducing the energy of the molecule.

    This means, in turn, that less energy is released on hydrogenation, as the molecule is already in a lower energy state.

    P.S. Your title is incorrect
    Thank you!
 
 
 
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