Question

(a) Draw the molecular orbitals for the cyclopropenyl case. (Since there are three $p$ orbitals, there must be three MOs: one all-bonding $\mathrm{MO}$ and one degenerate pair of MOs.) (b) Draw an energy diagram for the cyclopropenyl MOs. (The polygon rule may be helpful.) Label each MO as bonding, nonbonding, or antibonding, and add the nonbonding line. Notice that it goes through the approximate average of the MOs. (c) Add electrons to your energy diagram to show the configuration of the cyclopropenyl cation and the cyclopropenyl anion. Which is aromatic and which is antiaromatic?

          (a) Draw the molecular orbitals for the cyclopropenyl case.
(Since there are three $p$ orbitals, there must be three MOs: one all-bonding $\mathrm{MO}$ and one degenerate pair of MOs.)
(b) Draw an energy diagram for the cyclopropenyl MOs. (The polygon rule may be helpful.) Label each MO as bonding, nonbonding, or antibonding, and add the nonbonding line. Notice that it goes through the approximate average of the MOs.
(c) Add electrons to your energy diagram to show the configuration of the cyclopropenyl cation and the cyclopropenyl anion. Which is aromatic and which is antiaromatic?

Added by Sarah R.

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