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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 π 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 p*2p molecular orbital. (c) Is the C¬C bond
in ethylene stronger or weaker in the excited state than in the
ground state? Why?