Unit 13: Carboxylic Acids

41. Which of the following is the strongest acid among carboxylic acids?

a) Formic acid
b) Acetic acid
c) Propionic acid
d) Butyric acid
Answer: a) Formic acid

42. The common name of ethanoic acid is:

a) Acetic acid
b) Formic acid
c) Propionic acid
d) Butyric acid
Answer: a) Acetic acid

43. Which reagent is commonly used to reduce carboxylic acids to primary alcohols?

a) NaBH4
b) LiAlH4
c) KMnO4
d) H2SO4
Answer: b) LiAlH4

44. Which of the following carboxylic acids has the highest boiling point?

a) Formic acid
b) Acetic acid
c) Propionic acid
d) Butyric acid
Answer: d) Butyric acid

45. Carboxylic acids are soluble in water due to:

a) Van der Waals forces
b) Covalent bonding
c) Hydrogen bonding
d) Ionic bonding
Answer: c) Hydrogen bonding

46. The oxidation of a methyl group attached to a benzene ring forms:

a) Benzoic acid
b) Acetic acid
c) Propanoic acid
d) Butyric acid
Answer: a) Benzoic acid

47. The reaction of a carboxylic acid with an amine produces:

a) An ester
b) An amide
c) A ketone
d) An alcohol
Answer: b) An amide

48. Which of the following carboxylic acids is used as a food preservative?

a) Benzoic acid
b) Formic acid
c) Acetic acid
d) Citric acid
Answer: a) Benzoic acid

49. What happens when a carboxylic acid is treated with sodium bicarbonate?

a) Carbon dioxide is released.
b) Water is released.
c) Oxygen is released.
d) Hydrogen is released.
Answer: a) Carbon dioxide is released.

50. The process of removing the carboxyl group from a carboxylic acid is called:

a) Esterification
b) Decarboxylation
c) Saponification
d) Hydrogenation
Answer: b) Decarboxylation