Question 1

Which of the following statements best explains why carboxylic acids have higher boiling points than alcohols of similar molar mass?

Accepted Answer

Carboxylic acids form dimers through two hydrogen bonds, effectively doubling their mass and increasing boiling point.

Question 2

What is the IUPAC name for the following compound: $$\mathrm{CH_3CH_2COOH}$$?

Accepted Answer

Propanoic acid

Question 3

Which of the following carboxylic acids is responsible for the sour taste of vinegar?

Accepted Answer

Ethanoic acid

Question 4

A student is asked to draw the line-angle formula for 4-chlorohexanoic acid. Which of the following is the correct structure?

Accepted Answer

A six-carbon chain with a carboxyl group at one end and a chlorine atom on carbon 4.

Question 5

Which of the following equations correctly represents the ionization of butanoic acid in water?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2COOH + H_2O \rightarrow CH_3CH_2CH_2COO^- + H_3O^+}$$

Question 6

Which of the following best describes why carboxylic acids with one to five carbon atoms are very soluble in water?

Accepted Answer

They form hydrogen bonds with water molecules due to their polar carboxyl group.

Question 7

Which of the following is the correct balanced equation for the neutralization of propanoic acid with sodium hydroxide?

Accepted Answer

$$\mathrm{CH_3CH_2COOH + NaOH \rightarrow CH_3CH_2COONa + H_2O}$$

Question 8

Which of the following carboxylate salts is commonly used as a preservative in bread and bakery items?

Accepted Answer

Sodium propionate

Question 9

Alpha hydroxy acids (AHAs) are used in skin care products because they:

Accepted Answer

Remove acne scars and reduce irregular pigmentation by promoting exfoliation.

Question 10

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH(CH_3$)COOH}$$?

Accepted Answer

2-methylpropanoic acid

Question 11

During metabolism, which carboxylate ion is formed from the dissociation of pyruvic acid?

Accepted Answer

Pyruvate

Question 12

Which of the following best explains why carboxylic acids are considered weak acids?

Accepted Answer

They only partially dissociate in water, producing carboxylate ions and hydronium ions.

Question 13

Which of the following is a correct statement about the role of carboxylate ions in the citric acid cycle?

Accepted Answer

Carboxylate ions are oxidized and decarboxylated to produce energy for cells.

Question 14

Which of the following compounds would have the lowest boiling point: pentane, 2-butanol, or propanoic acid (all have similar molar mass)?

Accepted Answer

Pentane

Question 15

Which of the following is the correct name for the compound with the structure $$\mathrm{C_6H_5COOH}$$?

Accepted Answer

Benzoic acid

Question 16

Which of the following best describes the effect of increasing the number of carbon atoms in a carboxylic acid on its solubility in water?

Accepted Answer

Solubility decreases as the nonpolar hydrocarbon chain increases.

Question 17

Which of the following is a correct product of the reaction between acetic acid and potassium hydroxide?

Accepted Answer

$$\mathrm{CH_3COOK + H_2O}$$

Question 18

Which of the following is a common use of sodium benzoate?

Accepted Answer

As a preservative in juices and jams

Question 19

Which of the following best describes the structure of an alpha hydroxy acid (AHA)?

Accepted Answer

A carboxylic acid with a hydroxyl group on the alpha carbon adjacent to the carboxyl group.

Carboxylic Acids: Structure, Naming, Properties, and Biological Importance

Study Guide - Practice Questions