Molecular formula: C6H6The Kekule structure (draw on whiteboard in session) - has the hexagonal shape of the ring, with a carbon=carbon double bond on every other carbon-carbon link. This has been proven to be incorrect - the bond lengths in a benzene ring have been measured and the lengths of all six bonds are the same. The lengths measured put the bonds as between the length of carbon=carbon double bonds (shorter) and carbon-carbon single bonds (longer) leading to the currently accepted structure of benzene with the ring of delocalised electrons present (draw in session).