What is a common feature of aromatic compounds?

Aromatic compounds are characterized by their unique structural features that include having planar structures and delocalized electrons, which are essential for their stability and chemical behavior. The concept of delocalization refers to the way electrons are shared across multiple atoms within the compound, typically involving conjugated systems where p-orbitals overlap, allowing for greater stability. This delocalization is a key aspect that contributes to the overall aromaticity of the compound, governed by Huckel's rule, which states that a compound is aromatic if it is cyclic, planar, fully conjugated, and has (4n + 2) π electrons, where n is a non-negative integer.

Aromatic compounds being planar is significant because it allows for optimal overlap of the p-orbitals, enhancing the delocalization of electrons. This structural arrangement results in a lower energy state and imparts unique chemical properties, such as increased stability compared to non-aromatic and anti-aromatic compounds. Understanding this feature is fundamental in both organic chemistry and applications in various fields, including pharmaceuticals, where aromatic compounds are prevalent in many medicinal structures.

The other options, while related to chemical structures, do not accurately capture the defining characteristic of aromatic compounds. For instance, while aromatic compounds may contain double