CH3−COO18H+C2H5OH→Conc. H2SO4 Products. Products are
CH3−COO18C2H5 ; H2O
CH3COO18C2H5 ; H2O18
CH3COO C2H5 ; H2O
CH3COO C2H5 ; H2O18
Esterification involves C – O cleavage of R – COOH and O – H cleavage of R – OH