Benzene has the formula C6H6 and is classified as an aryl or aromatic organic compound because its chemistry is dominated by the ring of delocalised pi electrons that sits above and below the carbon skeleton.
The majority of commercial dyes, pesticides and pharmaceutical drug molecules contain a benzene functional group.
Understanding the structure of benzene
What is the evidence for the delocalised ring of electron model for benzene over the structure proposed by August Kekulé in 1865?