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Carboxylic acid - Quiz
Contributed by: Lloyd
  • 1. Which enzyme catalyzes the carbonation step in photosynthesis to produce carboxylic acids?
A) Citrate synthase
B) Fatty acid synthase
C) Acetyl-CoA carboxylase
D) Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCo)
  • 2. Which carboxylic acid is a precursor to solvents and coatings?
A) Citric acid
B) Acetic acid
C) Terephthalic acid
D) Propionic acid
  • 3. What is the main component of lipids?
A) Polyamides of aminocarboxylic acids
B) Esters of fatty acids
C) Polymers
D) Carboxylate salts
  • 4. Which process is used industrially for the production of acetic acid?
A) Cativa process (carbonylation of alcohols)
B) Hydroformylation of alkenes
C) Hydrocarboxylation of alkenes
D) Oxidation of aldehydes with air
  • 5. Which carboxylic acid is produced by the oxidation of toluene?
A) Benzoic acid
B) Terephthalic acid
C) Phthalic acid
D) Acrylic acid
  • 6. Which carboxylic acid is used as a food preservative?
A) Adipic acid
B) Propionic acid
C) Acetic acid
D) Citric acid
  • 7. Which carboxylic acid is a precursor to polymers and adhesives?
A) Citric acid
B) Acrylic and methacrylic acids
C) Propionic acid
D) Adipic acid
  • 8. Which method involves the hydrolysis of triglycerides to produce long-chain carboxylic acids?
A) Oxidation of primary alcohols
B) Soap making
C) Fermentation of ethanol
D) Carbonation of Grignard reagents
  • 9. Which carboxylic acid is used as a chelating agent?
A) Maleic acid
B) Ethylenediaminetetraacetic acid
C) Acetic acid
D) Citric acid
  • 10. Which carboxylic acid is produced from para-xylene?
A) Benzoic acid
B) Acrylic acid
C) Terephthalic acid
D) Phthalic acid
  • 11. Which process is used to produce vinegar?
A) Fermentation of ethanol
B) Carbonylation of alcohols
C) Oxidation of aldehydes with air
D) Hydrocarboxylation of alkenes
  • 12. Which carboxylic acid is a flavor and preservative in food and beverages?
A) Acetic acid
B) Propionic acid
C) Citric acid
D) Adipic acid
  • 13. Which carboxylic acid is produced by the Kolbe–Schmitt reaction?
A) Terephthalic acid
B) Phthalic acid
C) Benzoic acid
D) Salicylic acid
  • 14. Which carboxylic acid is produced from ortho-xylene?
A) Terephthalic acid
B) Benzoic acid
C) Phthalic acid
D) Acrylic acid
  • 15. Which carboxylic acid is used in the production of polymers?
A) Ethylenediaminetetraacetic acid
B) Propionic acid
C) Adipic acid
D) Citric acid
  • 16. Which carboxylic acid is produced by the oxidation of propene?
A) Maleic acid
B) Benzoic acid
C) Acrylic acid
D) Terephthalic acid
  • 17. Which carboxylic acid is a main component of proteins?
A) Esters of fatty acids
B) Polyamides of aminocarboxylic acids
C) Carboxylate salts
D) Polymers
  • 18. Which carboxylic acid is used as a coating?
A) Adipic acid
B) Citric acid
C) Propionic acid
D) Fatty acids
  • 19. Which carboxylic acid is produced by the hydrolysis of nitriles?
A) Esters
B) Carboxylic acids
C) Ketones
D) Amides
  • 20. What is the general formula often used to represent a carboxylic acid?
A) R−NH2
B) R−CHO
C) R−COOH or R−CO2H
D) R−OH
  • 21. Which functional group is present in a carboxylic acid?
A) Hydroxyl group (−OH)
B) Amino group (−NH2)
C) Aldehyde group (−CHO)
D) Carboxyl group (−C(=O)−OH)
  • 22. In the nomenclature of complex molecules, what position is the carboxyl group considered?
A) Position three
B) Position two
C) Position four
D) Position one
  • 23. What is the conjugate base of acetic acid called?
A) Acetone
B) Acetyl
C) Acetic
D) Acetate
  • 24. Why do smaller carboxylic acids (1 to 5 carbons) dissolve in water?
A) Due to their ability to hydrogen bond with water
B) Due to their high molecular weight
C) Due to their large molecular size
D) Due to their nonpolar nature
  • 25. What happens when carboxylic acids react with aqueous sodium hydroxide?
A) They decompose into alcohols and ketones
B) They yield water-soluble sodium salts
C) They form esters
D) They form insoluble sodium salts
  • 26. Why do carboxylic acids usually exist as dimers in nonpolar media?
A) Due to their tendency to self-associate through hydrogen bonding
B) Due to their ionic nature
C) Due to their nonpolar nature
D) Due to their high solubility in nonpolar media
  • 27. What is the solubility characteristic of enanthic acid in water?
A) Low solubility (0.2 g/L)
B) High solubility
C) Moderate solubility
D) Complete insolubility
  • 28. What is the result of the deprotonation of a carboxylic acid?
A) A carboxylic alcohol
B) A carboxylic ester
C) A carboxylic ketone
D) A carboxylate anion
  • 29. What is the suffix used for the conjugate base of a carboxylic acid?
A) -ous
B) -ic
C) -ate
D) -ide
  • 30. What is the role of the hydroxyl group in a carboxylic acid?
A) Acts as a hydrogen-bond acceptor
B) Acts as an electron donor
C) Acts as an electron acceptor
D) Acts as a hydrogen-bond donor
  • 31. What is the role of the carbonyl group in a carboxylic acid?
A) Acts as an electron acceptor
B) Acts as a hydrogen-bond donor
C) Acts as an electron donor
D) Acts as a hydrogen-bond acceptor
  • 32. What is the general behavior of carboxylic acids in water?
A) They do not ionise
B) They completely ionise
C) They decompose
D) They partially ionise (dissociate)
  • 33. What is the general behavior of carboxylic acids in nonpolar media?
A) They decompose
B) They exist as dimers
C) They dissolve completely
D) They ionise
  • 34. What is the role of the carboxyl group in a carboxylic acid?
A) It is the functional group
B) It is a side chain
C) It is a substituent
D) It is a solvent
  • 35. What is the solubility characteristic of butanoic acid in water?
A) Insoluble
B) Completely insoluble
C) Soluble
D) Partially soluble
  • 36. What is the general formula for the conjugate base of a carboxylic acid?
A) R−COOH
B) R−COO− or R−CO−2
C) R−CHO
D) R−OH
  • 37. What type of acids are carboxylic acids according to the Brønsted–Lowry theory?
A) Proton (H+) acceptors.
B) Proton (H+) donors.
C) Electron donors.
D) Electron acceptors.
  • 38. Which reaction involves the disproportionation of an aldehyde to form a carboxylic acid?
A) Fischer esterification reaction
B) Von Richter reaction
C) Kolbe–Schmitt reaction
D) Cannizzaro reaction
  • 39. In which reaction do nitrobenzenes convert to benzoic acids?
A) Benzilic acid rearrangement
B) Cannizzaro reaction
C) Kolbe–Schmitt reaction
D) Von Richter reaction
  • 40. Which reaction is used to convert carboxylic acids into esters?
A) Kolbe–Schmitt reaction
B) Von Richter reaction
C) Cannizzaro reaction
D) Fischer esterification reaction
  • 41. What is required for the conversion of amino acids into peptides?
A) Diazomethane
B) Phenols
C) Sodium bicarbonate
D) ATP
  • 42. Which reagent is used to convert carboxylic acids to methyl esters?
A) Sodium bicarbonate
B) Nitrobenzenes
C) Diazomethane
D) Phenols
  • 43. Which reaction is mainly of academic interest and involves the generation of benzoic acids from phenols?
A) Kolbe–Schmitt reaction
B) Benzilic acid rearrangement
C) Von Richter reaction
D) Cannizzaro reaction
  • 44. Which reagent can reduce carboxylic acids to alcohols?
A) Grignard reagents
B) Thionyl chloride
C) Phosphorus(III) chloride
D) Lithium aluminium hydride
  • 45. Which reducing agent will convert carboxylic acids to ketones?
A) Organolithium compounds
B) Thionyl chloride
C) Lithium aluminium hydride
D) Grignard reagents
  • 46. What is the product when a carboxylic acid is reduced using the Vilsmaier reagent?
A) Alcohol
B) Aldehyde
C) Acid chloride
D) Ketone
  • 47. Which reagent is used to convert carboxylic acids to acyl chlorides?
A) Thionyl chloride
B) Organolithium compounds
C) Vilsmaier reagent
D) Lithium aluminium hydride
  • 48. What byproduct is formed when carboxylic acids react with thionyl chloride?
A) Phosphorus(V) oxychloride
B) Hydrogen chloride
C) Phosphorus acid
D) Sulfur dioxide
  • 49. Which phosphorus compound can convert carboxylic acids to acid chlorides in a 1:1 ratio?
A) Lithium aluminium hydride
B) Thionyl chloride
C) Phosphorus(III) chloride (PCl3)
D) Phosphorus(V) chloride (PCl5)
  • 50. Which reagent is not suitable for reducing carboxylic acids to ketones?
A) Organolithium compounds
B) Vilsmaier reagent
C) Grignard reagents
D) Lithium aluminium hydride
  • 51. Which reagent can tolerate reactive carbonyl functionalities during carboxylic acid reduction?
A) Vilsmaier reagent
B) Thionyl chloride
C) Phosphorus(III) chloride
D) Lithium aluminium hydride
  • 52. What is the product formed when carboxylic acids react with Grignard reagents and organolithiums?
A) Esters
B) Ketones
C) Aldehydes
D) Alcohols
  • 53. Which reaction is the inverse of the Barbier–Wieland degradation?
A) Arndt–Eistert synthesis
B) Hell–Volhard–Zelinsky halogenation
C) Kolbe electrolysis
D) Schmidt reaction
  • 54. Which reduction method converts carboxylic acids to aldehydes via the ester?
A) DIBAL reduction
B) Rosenmund reduction
C) Kolbe electrolysis
D) Fukuyama reduction
  • 55. What is the main purpose of the Kolbe electrolysis?
A) Oxidative decarboxylation
B) Conversion to amines
C) Reduction to alcohols
D) Decarboxylative dimerization
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