Which of the following statements are correct regarding esterification of alcohols?
I. Alcohols react with carboxylic acids, acid chlorides, and acid anhydrides to form esters.
II. The reaction with carboxylic acid and acid anhydride is carried out in presence of a small amount of conc. 
.
III. The reaction with acid chloride is carried out in presence of a base (pyridine) to neutralize the sideproduct 
.
IV. The reaction with carboxylic acid and acid anhydride is reversible while with acid chloride, it is irreversible.
Text Solution
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The reduction of carboxylic acid and acid anhydride is carried out in presence of small amount of conc. 
. Also, this reaction is reversible therefore, water is removed as soon as it is formed. The reaction of 
with acid chloride is irreversible, so to shift the equilibrium to the right hand side, pyridine is used which removes 
from the reaction mixture.
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