Lexikon
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aliphatic hydrocarbons
hydrocarbons in which the carbon-hydrogen groupings are arranged in open chains (that might include branches). The term includes paraffins and olefins and provides a distinction from aromatics and naphthenes, which have at least some of their carbon atoms arranged in closed chains or rings. The paraffins, called also alkanes are saturated hydrocarbons, in their molecules the carbon atoms are bound by single bonds, e.g. hexadecane (C16H34). The olefins are unsaturated hydrocarbons, in their molecules there are carbon atoms, which are bound by double bond, e.g. hexadecene (C16H34) contains one double bond, butadiene (C4H4) contains two double bonds.
hydrocarbons
molecules that consist only of hydrogen and carbon atoms. hydrocarbons can be found in raw oil (petroleum hydrocarbons), gas and coal. hydrocarbons can be aliphatic hydrocatrbons with methane as the simplest and aromatics with benzene as the basic unit. The aliphatic hydrocarbons can be divided into alkanes, alkenes and alkines depending on the carbon-carbon bond.