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Alkane Definition. An alkane is a fully saturated carbon or hydrocarbon chain. Fully saturated means that there are as many hydrogens attached to the carbons as possible and only single bonds between carbons exist, like so: H 3 CCH 3.Alkanes are also referred to as alkyl groups.lkane Definition. An alkane is a fully saturated carbon or hydrocarbon chain. Fully saturated means that there are as many hydrogens attached to the carbons as possible and only single bonds between carbons exist, like so: H 3 CCH 3. Alkanes are also referred to as alkyl groups.
Polycyclic aromatic hydrocarbons (PAHs, also polyaromatic hydrocarbons) are hydrocarbons â organic compounds containing only carbon and hydrogenâthat are composed of multiple aromatic rings (organic rings in which the electrons are delocalized).yrimidine, like other polycyclic aromatic hydrocarbons (PAHs), the most abundant carbon-rich compounds found in the universe, may have been formed in red giants or in interstellar dust and gas clouds.