Answer: methanes

AnswerCrossword Clue
METHANESGaseous hydrocarbons.
methanesMETHANE, a flammable gas
methanesa colorless odorless flammable gaseous hydrocarbon CH4 that is a product of decomposition of organic matter and of the carbonization of coal, is used as a fuel and as a starting material in chemical synthesis, and is the simplest of the alkanes