From the course of “Organic chemistry”, it is known that the conjugated system has lower maintenance of energy, i.e. lower energy level, in other words, is more thermodynamically stable, than the system with the isolated multiple bonds. Degree of thermodynamic stability was quantified as the difference between the energies of the molecules with the conjugated and isolated bonds, which is designated as the pairing energy (resonance energy or energy of delocalization). For example, the gain of energy as a result of conjugation of two p-bonds in 1,3- butadiene equals to 15 kJ/mol.