2CH3−COOH + Zn → HCOOH + NaOH → CH3COOH + C2H5OH →
2CH3−COOH + Zn →(CH3-COO)2Zn+H2HCOOH + NaOH → HCOONa+H2O CH3COOH + C2H5OH → CH3COOC2H5+H2O