The closed cycle compound with delocalized electron is called aromatic compound.
Aromatic compound are these closed cycle organic compound that have at least 4n + 2 number of the delocalized pi electron.
According to Huckel rule aromatic compound should have 4n + 2 number of pi electron.
Properties of aromatic compound is called aromaticity. All of the closed compound are not aromatic.
Though, in general thought compound with one or more benzene ring that have delocalized electron is aromatic. But in really compound except benzene ring may be aromatic compound.
Example, Pyrole is a aromatic compound.
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