Benzene or 1,3,5-Cyclohexatriene Interpretation of Resonance Structures

Cyclohexatriene to benzene displays a sequence of structures from 1,3,5-cyclohexatriene (withCC single and double bonds initially set to 1.5 and 1.3 A, respectively) to benzene (witb all CC bonds set to 1.4 A) and back to cyclohexatriene. Plot energy (vertical axis) vs. CC bond length (horizontal axis). How many energy minima are there Do the minima look more like 1,3,5-cyclohexatriene or benzene What is the correct interpretation of the resonance picture  

Repeat the analysis with 1,2-dichlorocyclohexatriene to 1,2-dichlorobenzene. Are there one or two energy minima If two, which is more stable, the structure with the short C1C2 bond or the long C1C2 bond Explain. 

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