The energy-level diagram in Figure 9.36 shows that the sideways overlap of a pair of p
Chapter 17, Problem 9.108(choose chapter or problem)
The energy-level diagram in Figure 9.36 shows that the sideways overlap of a pair of p orbitals produces two molecular orbitals, one bonding and one antibonding. In ethylene there is a pair of electrons in the bonding p orbital between the two carbons. Absorption of a photon of the appropriate wavelength can result in promotion of one of the bonding electrons from the p2p to the molecular orbital. (a) What would you expect this electronic transition to do to the carboncarbon bond order in ethylene? (b) How does this relate to the fact that absorption of a photon of appropriate wavelength can cause ready rotation about the carboncarbon bond,as described in the Chemistry and Lifebox and shown in Figure 9.30?
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