Explain resonance and stability of benzene.

Explanation

The actual structure of benzene is a combination of all these structures called resonance hybride and structures contributing to this hybrid structure are known as resonance structures. Benzene is a resonance hybrid of the following resonance structures.
Kekule's structures contribute to resonance hybrid to the extent of 80% hence they explain most of the reactions of benzene. the energy difference between kekule structrure and resonance hybrid is called resonance energy which accounts for unsual stability of benzene.