Fischer esterification involves which two species and what is the general product?

• A. The corresponding ester (e.g., ethyl benzoate)
• B. The amide
• C. The anhydride
• D. The alcohol

Answer: (C)

Fischer esterification uses a carboxylic acid reacting with an alcohol in the presence of an acid catalyst to form an ester and water. The acid catalyst helps by protonating the carbonyl to make it more reactive toward the alcohol, and water is eliminated to give the ester. Because it’s an equilibrium, removing water or using excess alcohol can drive the reaction toward ester formation. So the two species involved are the carboxylic acid and the alcohol, and the general product is an ester (for example, ethyl benzoate from benzoic acid and ethanol).