This explains an equal possibility for the formation of C1 -C2, C3 -C4, C5 -C6 π bonds or C2 -C3, C4 -C5, C6 -C1 π bonds. The hybrid structure is represented by inserting a circle in the ring as shown above in the scheme 1. Hence, it explains the formation of two resonance structures proposed by Kekule and they will always be in dynamic equilibrium. At any given point of time during the dynamic equilibrium process of benzene, the statistical percentage of existence of either A and B in scheme 2 is 50:50. Now comparing the structure B and the structure of the 5-X-2-Y-heterocycle C of scheme 2, the functional group Y and the substituent X are separated by one single bond and two double bonds or simply by two pairs of π-electrons in benzene ring B and the heterocycle C. Therefore, it can be assumed that the substituent electronic effects can be transmitted from carbon 4 bearing the substituent X to the functional group Y at carbon 1 of the benzene. This kind of situation of the structure C where in the substituent electronic effects can be transmitted from carbon 5 bearing the substituent X to the functional group Y at carbon 2 of the hetercycle would be just like that of structure B. Therefore carbon 5 of the structure C of scheme 2 could best be assumed as a para-carbon.