А)C2H5COOH +Na2S--> Б)CH3COOH+Li--> В)C2H5OH+CH3OH-->
2CH3-CH2COOH + Na2S -> 2CH3-CH2COONa + H2S↓ 2CH3COOH + 2Li -> 2CH3COOLi + H2 CH3-CH2OH + HO-CH3 -> CH3CH2-O- CH3 + H2O