Aromatic compounds contain a benzene ring structure from "summary" of Chemistry by Russell Kuhtz
When we examine the structure of aromatic compounds, we find a common feature that distinguishes them from other types of organic molecules. This distinguishing characteristic is the presence of a benzene ring. A benzene ring is a hexagonal ring of carbon atoms with alternating single and double bonds between them. This unique arrangement of bonds gives the benzene ring exceptional stability, which is a key factor in the unique properties of aromatic compounds. The stability of the benzene ring arises from the delocalization of pi electrons around the ring. In other words, the electrons in the double bonds are not confined to specific carbon-carbon bonds but are shared among all six carbon atoms in the ring. This delocalization of electrons results in a resonance structure where the double bonds continuously shift around the ring. As a result, the benzene ring is more stable than would be expected based on a simple alternating pattern of single and double bonds. This stability is what gives aromatic compounds their distinct properties. For example, aroma...
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