ORGANIC CHEMISTRY Chapter 2 Methane Ethene Ethyne (an alkane (an alkene) an alkyne Benzene (a representative aromatic hydrocarbon) Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 2 Methane (an alkane) Ethene (an alkene) Ethyne (an alkyne) Benzene (a representative aromatic hydrocarbon)