The answer is A. Aromatic rings are structures not found in aliphatic compounds since they are another classification of hydrocarbons. Aliphatic compounds are also known as non-aromatic compounds. They can be cyclic, alkanes, alkenes and alkynes
Aliphatic compounds include alkanes, alenes, alkynes, straight or branched structures. Aromatic rings have a different structure that is not found in aliphatic compounds.
