Esterification Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following reaction classifications best describes the conversion of a carboxylic acid to an ester during acid-catalyzed Fischer esterification?

   • A) Electrophilic addition
   • B) Nucleophilic aliphatic substitution
   • C) Nucleophilic acyl substitution
   • D) Free-radical substitution
2. 2.

   Which of the following experimental procedures is most effective for shifting the equilibrium of a Fischer esterification reaction to maximize the yield of the ester?

   • A) Adding excess water to the reaction flask as the reaction proceeds
   • B) Continuously removing water from the reaction mixture as it forms
   • C) Continuously adding the ester product to the reaction flask
   • D) Adding a stoichiometric amount of strong base to neutralize the acid catalyst
3. 3.

   When a carboxylic acid reacts with an alcohol enriched with the $^{18}\text{O}$ isotope during an acid-catalyzed esterification, in which product is the isotopic label found?

   • A) Exclusively in the ester
   • B) Exclusively in water
   • C) Equally distributed between the ester and water
   • D) Exclusively in the regenerated acid catalyst
4. 4.

   What is the primary role of the acid catalyst during a Fischer esterification reaction?

   • A) It protonates the carbonyl oxygen of the carboxylic acid, making the carbonyl carbon more electrophilic.
   • B) It deprotonates the alcohol to generate a strongly nucleophilic alkoxide ion.
   • C) It acts as a reducing agent that converts the carboxylic acid into an aldehyde intermediate.
   • D) It converts the carboxylic acid directly into a reactive acyl chloride intermediate.
5. 5.

   Which of the following pairs of organic compounds reacts in the presence of an acid catalyst to produce ethyl propanoate and water?

   • A) Ethanoic acid and propan-1-ol
   • B) Propanoic acid and ethanol
   • C) Propan-1-ol and ethanal
   • D) Propanoic acid and diethyl ether