Explanation: For a compound to be considered aromatic, it must be flat, cyclic, and conjugated and it must obey Huckel's rule. Huckel's rule states that an aromatic compound must have pi electrons in the overlapping p orbitals in order to be aromatic (n in this formula represents any integer).

What compounds are considered aromatic?

Aromatics are hydrocarbons, organic compounds that consist exclusively of the elements carbon and hydrogen – without which life would not be possible on Earth. The main aromatics are benzene, toluene and the xylenes; they are used as starting materials for a wide range of consumer products.

What is not aromatic?

Cyclooctatetraene is not aromatic in nature. In cyclooctatetraene, delocalisation of π− electrons takes place but HuckeFs rule is not followed.