PART 12: BENZENE ABSORPTION BANDS

In this video, I have explained the absorption bands of benzene. UV spectrum of benzene shows three well known absorption bands related to three electronic excitations from the ground state to the excited states explained in the literature.The benzenoid band corresponds to a low-energy π→π∗ transition of the benzene molecules. The absorption intensity is weak because the π∗ state involved has the same electronic symmetry as the ground state of benzene, and transitions between symmetrical states usually are forbidden. The transitions are observed in this case only because the vibrations of the ring cause it to be slightly distorted at given instants.
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