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(C) It is possible to interconvert $cis$ and $trans$ alkenes,but the $\pi$-bond must be broken first. This requires a considerable amount of energy,ar

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(C) It is possible to interconvert $cis$ and $trans$ alkenes,but the $\pi$-bond must be broken first. This requires a considerable amount of energy,around $260 \ kJ \ mol^{-1}$. One way to break the $\pi$-bond would be to promote an electron from the $\pi$-orbital to the $\pi^*$-orbital. If this were to happen,there would be one electron in the bonding $\pi$-orbital and one in the antibonding $\pi^*$-orbital and hence no overall bonding. Electromagnetic radiation of the correct energy could promote the electron from $HOMO$ to $LUMO$. The correct energy actually corresponds to light in the ultraviolet $(UV)$ region of the spectrum. Thus,shining $UV$ light on an alkene would promote an electron from its bonding $\pi$-molecular orbital to its antibonding $\pi^*$-molecular orbital,thereby breaking the $\pi$-bond (but not the $\sigma$-bond) and allowing rotation to occur.

Which energy diagram best represents the given reaction?

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