Delocalisation in benzene refers to how the electrons in the pi system are free to move around the ring (i.e. the electrons are not localised/fixed into just one bond).
This gives the molecule a greater degree of stability compared to if the electrons weren't delocalised. The delocalisation energy is this extra stability gained.
Delocalisation in benzene refers to how the electrons in the pi system are free to move around the ring (i.e. the electrons are not localised/fixed into just one bond).
This gives the molecule a greater degree of stability compared to if the electrons weren't delocalised. The delocalisation energy is this extra stability gained.