Q 12.18 Give plausible explanation for each of the following:
(iii) During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.
If either water or the ester is not removed immediately then ester can react with water and again and give back the reactants.
Thus to shift the reaction in forward direction we need to produce more ester or remove either of the two.