Free Carboxylic Acids MCQs with Answers
22 Carboxylic Acids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
22 questions · page 3 of 3
21. Fischer esterification is which type of reaction:
- A. Condensation
- B. Substitution
- C. Elimination
- D. Dehydrogenation
Explanation: A carboxylic acid and an alcohol join with the loss of a small molecule, water, which is the definition of a condensation, and concentrated sulphuric acid catalyses it while also shifting the equilibrium by removing that water. The reaction is reversible, so the yield is never complete. Nucleophilic acyl substitution describes the mechanism, but the reaction type the question asks for is condensation.
Correct answer: Condensation22. Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces
- A. Carbonates
- B. Alkane
- C. Ester
- D. Amide
Explanation: The ammonium carboxylate loses a molecule of water on strong heating and the nitrogen ends up bonded directly to the carbonyl carbon, giving an amide. An ester would require an alcohol rather than ammonia, which is the standard confusion here. The amide link formed in this way is the same one that joins amino acids in a protein.
Correct answer: Amide