Open Odyssey, click on the Labs (complete list) button at the top of the screen.  Choose Resonance of Benzene (F24).  Follow all of the directions (including those in the Questions section).  Answer the questions below for Hypothetical Benzene I & II (models from Energy calculations with constrained alternating double and single bonds). The high electron density surface indicates the presence of double bonds. The single bond length is 153 pm (picometers). The double bond length is 133 pm. The energy of the models is negative and greater than 600,000 kJ/mol.   Answer the questions below for Hypothetical Benzene (models from Equilibrium calculation with unconstrained carbon-carbon bonds). The C-C bonds have lengths of 138 pm and bond orders of 1.5 . Compared to Hypothetical Benzene I & II, the energy of this model is more negative indicating it is more stable .