Some degree of it is always present and can be estimated by quantum mechanical calculations.
Its effects are particularly evident in aromatic systems and in symmetrical molecular entities. Some degree of it is always present and can be estimated by quantum mechanical calculations. It has a corresponding energy, identifiable with the stabilization of the system compared with a hypothetical alternative in which formal single and double bonds are present. When it occurs, each link between atoms has a fractional double bond character or bond order. FTP, name this quantum mechanical concept most usually applied in organic chemistry to describe the pi bonding in a conjugated system.
Its effects are particularly evident in aromatic systems and in symmetrical molecular entities.
{delocalization}