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