16. Conjugated Systems

Which of the following molecular orbitals would you use to model a thermal electrocyclization reaction using frontier orbital theory?

Given the following molecular orbital diagram for diatomic molecules, which of the following species is expected to be the most stable? (Assume the diagram is for second-period homonuclear diatomics and consider bond order only.)

According to molecular orbital theory, which of the following correctly represents the order of molecular orbitals for $N_2$ from lowest to highest energy?

According to molecular orbital theory, what is the highest occupied molecular orbital (HOMO) for the molecule $B_2$?

According to molecular orbital theory, the thermal electrocyclic ring closure of ${\mathrm{1,3}}_{\text{butadiene}}$ to cyclobutene proceeds via which type of orbital motion?

What is another name for the molecular orbital theory of bonding in metals?

Which of the following statements is true for $\mathrm{molecular} \mathrm{orbitals}$?

Which of the following best describes the molecular orbital (MO) electron diagram for the $O^2+$ molecular ion?

Which of the following best describes the steps to construct a molecular orbital interaction diagram for $O_2$?

Below is one of the molecular orbitals of $HF$. Which of the following best describes the orbital?