The energy-level diagram in Figure shows that the sideways

Chapter , Problem 112AE

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The energy-level diagram in Figure  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

\(\pi_{2 p}\) to the \(\pi_{2 p}^{*}\)  molecular orbital.

(a) What would you expect this electronic transition to do to the carbon-carbon 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 carbon-carbon bond, as described in the "Chemistry and Life" box and shown in Figure  ?

Equation Transcription:

Text Transcription:

\pi_{2 p} \

\pi_2 p^*

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