Question: Electronic excitation of a molecule may weaken or strengthen some bonds because bonding and antibonding characteristics differ between the HOMO and the LUMO. For example,

Electronic excitation of a molecule may weaken or strengthen some bonds because bonding and antibonding characteristics differ between the HOMO and the LUMO. For example, a carbon-carbon bond in a linear polyene may have bonding character in the HOMO and antibonding character in the LUMO.
Therefore, promotion of an electron from the HOMO to the LUMO weakens this carbon-carbon bond in the excited electronic state, relative to the ground electronic state. Display the HOMO and LUMO of each molecule in Problem 11.15 and discuss in detail any changes in bond order that accompany the π*← π ultraviolet absorptions in these molecules.

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