Benzene , C6H6 , is the simplest aromatic hydrocarbon , and it was the first one named as such . The nature of its bonding was first recognized by August Kekulé in the 19th century .
Benzene , C6H6 , is the simplest aromatic hydrocarbon and was recognized as the first aromatic hydrocarbon , with the nature of its bonding first being recognized by Kekulé in the 19th century .