
Cyclopentane is a highly flammable alicyclic hydrocarbon with chemical formula {carbon}5{hydrogen}10 and CAS number 287-92-3, consisting of a ring of five carbon atoms each bonded with two hydrogen atoms above and below the plane. It occurs as a colorless liquid with a petrol-like odor. Its melting point is −94 °C and its boiling point is 49 °...
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http://en.wikipedia.org/wiki/Cyclopentane

<chemical> A closed ring alicyclic hydrocarbon containing five carbon atoms, isomeric with pentene. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: sī′klō-pen′tān Definitions: 1. A closed ring hydrocarbon containing five carbon atoms, isomeric with pentene.
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http://www.medilexicon.com/medicaldictionary.php?t=22260

a colorless, water-insoluble liquid, CH, obtained from petroleum and used chiefly as a solvent. Also called
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https://www.infoplease.com/dictionary/cyclopentane
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