2.2 Methane and ethane representative alkanes 1) Methane and ethane are two members of a broad family of Organic compounds called hydrocarbon (% 2)Hydrocarbons are compounds whose molecules contain only carbon and hydrogen atoms-------- alkanes 3)Hydrocarbons whose molecules have a carbon-carbon double bond are called alkenes. and those with a carbon-carbon triple bond are called alkynes2.2 Methane and Ethane: Representative alkanes 1）Methane and ethane are two members of a broad family of Organic compounds called hydrocarbon （烃） 2) Hydrocarbons are compounds whose molecules contain only Carbon and hydrogen atoms-------- alkanes 3) Hydrocarbons whose molecules have a carbon-carbon double bond are called alkenes, and those with a carbon-carbon triple bond are called alkynes