CH3-CH(Cl)-COONa+CH3-CH2-Br=CH3-CH(Cl)-COO-C2H5 +NaBr
CH3-CH(Cl)-COONa+CH3-CH2-Br=CH3-CH(Cl)-COO--C2H5+NaBr
CH3-CH(Cl)-COONa+CH3-CH2-Br=CH3-CH(Cl)-COO-C2H5 +NaBr
CH3-CH(Cl)-COONa+CH3-CH2-Br=CH3-CH(Cl)-COO--C2H5+NaBr