Does the MO energy diagram of cyclooctatetraene (Figure 16-8) appear to be a particularly stable or unstable configuration? Explain
FIGURE 16-8 The polygon rule predicts that the MO energy diagrams for these annulenes will resemble the polygonal shapes of the annulenes.
Here we have to explain the stability of MO energy diagram of cyclooctatetraene.
The MO energy diagram of cyclooctatetraene is unstable due to unstable electronic configuration. In the structure of cyclooctatetraene, the 1st three pairs of electrons are present in three bonding molecular orbitals and two electrons(electrons 7 and 8) are located in two different nonbonding orbitals. As like cyclobutadiene, it is a planar structure with diradical, which is particularly unstable electronic configuration.