C2H4O2的同分异构体有3种,CH3COOH,HCOOCH3,HCOCH2OH
CH3COOH+NaOH==CH3COONa+H2O 乙酸钠
HCOOCH3+NaOH==HCOONa+CH3-OH 甲酸钠与甲醇
HCOCH2OH不与氢氧化钠反应