Consider the figures shown below and select the ones whose vertices correspond t

Question

Consider the figures shown below and select the ones whose vertices correspond to relative energy levels of the pi MOs of: 1) the cyclopropenyl cation, 2) the cyclobutenyl 2+ cation, 3) the cyclopentadienyl anion, and 4) benzene. You have used WebMO to calculate the pi MOs of some of the above species, and, lately you have been asked to consider the relative energy levels of the pi MOs on either the third exam, recent WQs, or on recent Action Center problem sets. Think back to these to help you answer this question. Hint: the horizontal diameter of each circle (not shown) is the cut-off for bonding MOs (below the diameter), non-bonding MOs (along the diameter), and anti-bonding MOs (above the diameter) VI VII VIII

Explanation / Answer

Ans : I corresponds to the relative energy levels of the pi MOs of the cyclopropenyl anion.

III corresponds to the relative energy levels of the pi MOs of the cyclobutenyl 2+ cation

VIII corresponds to the relative energy levels of the pi MOs of the cyclopentadienyl anion.

IV corresponds to the relative energy levels of the pi MOs of benzene.

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