General Formula Isomerism: CH 2n+2 Saturated hydrocarbons CnH2n Unsaturated hydrocarbons 1.碳链和双键位置异构： n- butane iso- 1-butene butene iso-butene cis-2-butene 2-butene trans-2-butene 二. General Formula & Isomerism: CnH 2n+2 Saturated hydrocarbons CnH 2n Unsaturated hydrocarbons 1. 碳链和双键位置异构: butane n- iso- butene 1-butene iso-butene 2-butene cis-2-butene trans-2-butene