只有四种,分别是：
甲酸甲酯；
甲酸乙酯；
乙酸甲酯；
乙酸乙酯.
反应方程式分别为：
CH3OH + HCOOH = HCOOCH3 + H2O;
CH3OH + CH3COOH = CH3COOCH3 + H2O;
CH3CH2OH + HCOOH = HCOOCH2CH3 + H2O;
CH3CH2OH + CH3COOH = CH3COOCH2CH3 + H2O;
反应条件均为浓H2SO4、△