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Cyclopentene is a chemical compound with the formula C5H8. It is a colorless liquid with a petrol-like odor. It is one of the cycloalkenes.
phenylacetylene · phenyl-acetylene · phenylethyne
Phenylacetylene is an alkyne hydrocarbon containing a phenyl group. It exists as a colorless, viscous liquid. In research, it is sometimes used as an analog for acetylene; being a liquid, it is easier to handle than acetylene gas.