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aliphatic compound
In organic chemistry, compounds composed of carbon and hydrogen are divided into two classes: aromatic compounds and aliphatic compounds (; G. ''aleiphar'', fat, oil) also known as non-aromatic compounds. Aromatic compounds contain an aromatic-ring configuration of atoms, such as benzene, whereas aliphatic compounds do not. Aliphatic compounds can be saturated, like hexane, or unsaturated, like hexene.
== Structure ==
Aliphatic compounds can be saturated, joined by single bonds (alkanes), or unsaturated, with double bonds (alkenes) or triple bonds (alkynes). Besides hydrogen, other elements can be bound to the carbon chain, the most common being oxygen, nitrogen, sulphur, and chlorine.
The simplest aliphatic compound is methane (CH4). Aliphatics include alkanes, alkenes, and alkynes.
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