How to write constitutional somers?(怎样写构形异构 体 CH3CHLCHCH, CH3 n-pentane Pentane CHCHCHoCH Isopentane 2-methylbutane CHCH H3C CH3 Neopentane 2, 2-dimethylpropane CHaHow to write constitutional isomers ? (怎样写构形异构 体 ?） CH3 CH2 CH2 CH2 CH3 n-pentane CH3 CHCH2 CH3 CH3 Isopentane H3 C CH3 CH3 CH3 Neopentane 2-methylbutane 2,2-dimethylpropane Pentane