This structure will be double far more dependable than the settings seen as an atom involving benzene interacting with the pi-cloud regarding acetylene. Your joining vitality of 2.Ninety one kcal/mol computed in the M06-2X/6-311+G(deb,r) degree for your cheapest energy #links# settings (1c) is in very good arrangement using the trial and error joining electricity of 2.7 +/- 2.Two kcal/mol with re