(1)CH3COOH(2)BC(3)3(4)C＞B＞A(5)CH3COOC2H5+NaOH→CH3COONa+C2H5OH,条件：△解析：A是CH2=CH2,B是C2H5OH，C是CH3COOH,D是CH3COOC2H5,E是CH3COONa
