
Cycloalkanes (also called naphthenes, but distinct from naphthalene) are types of hydrocarbon compounds that have one or more rings of carbon atoms in the chemical structure of their molecules. Alkanes are types of organic hydrocarbon compounds that have only single chemical bonds in their chemical structure. Cycloalkanes consist of only carbon (C...
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http://en.wikipedia.org/wiki/Cycloalkane

(from the article `hydrocarbon`) Cycloalkanes are ring structures with two fewer hydrogen atoms in the molecule of the corresponding alkane. Many have more than one ring. ...
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http://www.britannica.com/eb/a-z/c/173
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