The rigid rotor approximation is a useful model for the motion of de-localized pi-electrons for cyclic conjugated molecules. apply this model to benzene, assuming mobile electrons moving on a ring of radius of 1.39a. a. create an energy level diagram for the rotational states of the molecule b. calculate the energy and angular momentum of an electron in the highest occupied level. c. calculate the frequency of radiation that can induce a transition from highest occupied and lowest unoccupied levels