Помогите 2 вариант.........
1)C2H5COOH+CH3OH-->CH3COOCH3+H2O 2)2CH3COOH +Ca--->(CH3COO)2Ca+H2 3)C3H7COOH+NaOH--->C3H7COONa+H2O 4)HCOH+Ag2O--->HCOOH+2Ag