ch3ch2oh脱水形成ch2=ch2消去反应ch2=ch2加成形成ch2brch2br加成反应ch2brch2br与2h2o在naoh条件下形成ch2ohch2oh取代反应那就是乙二醇
乙醇:2CH3CH2OH+2Na→2CH3CH2ONa+H2↑乙二醇:HOCH2-CH2OH+2Na→NaOCH2-CH2ONa+H2↑