Question

what are aromatic hydrocarbons and aliphatic hydrocarbons ?

Answer 1

Aliphatic hydrocarbon are the straight long chain of Carbon.
Aromatic are referred as ring compounds.

Answer 2

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Aliphatic compounds are composed of straight-chained, branched, or cyclic compounds and can be saturated (alkanes) or unsaturated (alkenes, alkynes, and others), whereas aromatic compounds have one or more conjugated, benzene or heterocyclic rings within their structures.