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