Molecule A is significantly more water soluble than molecule B. Justify this observation.

Using the information in Figure 16-2, calculate the values of ∆H° for the following reactions:

(b)

Using the information in Figure 16-2, calculate the values of ∆H° for the following reactions:

(c)

Does the MO energy diagram of cyclooctatetraene (Figure 16-8) appear to be a particularly stable or unstable configuration? Explain.

If Kekulé's original hypothesis had been correct and benzene was really an equilibrium between two structures, how many distinct isomers would exist for 1,2-dichlorobenzene?

a. Draw the resonance forms of benzene, cyclobutadiene, and cyclooctatetraene, showing all the carbon and hydrogen atoms.

b. Assuming that these molecules are all planar, show how the p orbitals on the sp2 hybrid carbon atoms form continuous rings of overlapping orbitals above and below the plane of the carbon atoms.

Using the information in Figure 16-2, calculate the values of ∆H° for the following reactions:

(a)

Using the information in Figure 16-2, calculate the values of ∆H° for the following reactions:

(b)