④2CH3COOH+HOCH2-CH2OHCH3COOCH2-CH2OOCCH3+2H2O (3分)
(4)②2CH3CH2OH+O2 2CH3CHO+2H2O(3分)
31. (C) 有机化学答案.(1) (2分)
(2)加成反应(2分) 取代反应(2分)
(3)CH3OCH3(2分)