The л-electrons can flow freely across the conjugated system of a 1,3-butadiene The total length that the π-electrons can travel is 1.47 Å. H H 1 LH HTC H H What is the energy (J) required to promote an electron from the HOMO(highest occupied energy level) to the LUMO(highest unoccupied energy level)? [each C contributes one e] What wavelength of light does this correspond to?
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