Hydrocarbon compounds liquid : Octane and pentene is a hydrocarbon compound used as components of gasoline. Petroleum and Diesels used for engine. Hydrocarbon compounds gases: such as methane, propene, ethyne . Methane gas is used as fuels for LPG or even lighters. Ethyne can be used in flame torch . Butane when its mixed with propane. It also forms a compound that is used typically in fuels in lighters and it can be found in LPG , and also it is used in portable stoves.