Unusual Stability Hydrogenation of just one double bond in benzene is endothermic! --…(-359 predicted) 151kJ (-240 predicted) resonance energy energy 8kJ resonance energy -240 kJ/mol -232 kJ/mol -208 kJ/mol -120 kJ/mol energy Copyright 2005 Pearson Prentice Hall,Inc. 6 Chapter 16 6 Unusual Stability Hydrogenation of just one double bond in benzene is endothermic! =>