Question 1

Which of the following best describes the structure of a carboxyl group?

Accepted Answer

A carbonyl group (C=O) attached to a hydroxyl group (OH)

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 statements about the boiling points of carboxylic acids is correct?

Accepted Answer

Carboxylic acids have higher boiling points than alcohols of similar molar mass due to the formation of dimers via hydrogen bonding.

Question 4

Which of the following is the correct balanced equation for the ionization of butanoic acid in water?

Accepted Answer

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

Question 5

Which of the following carboxylic acids is most soluble in water?

Accepted Answer

Methanoic acid

Question 6

What is the product when propanoic acid reacts with sodium hydroxide ($$\mathrm{NaOH}$$)?

Accepted Answer

$$\mathrm{CH_3CH_2COONa} ($$sodium propanoate) and $$\mathrm{H_2O}$$

Question 7

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

Accepted Answer

Carboxylic acids can form two hydrogen bonds, creating stable dimers.

Question 8

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH_2COOCH_3}$$?

Accepted Answer

Methyl propanoate

Question 9

A patient is prescribed a topical cream containing lactic acid (an alpha hydroxy acid) for skin treatment. Which structural feature makes lactic acid an alpha hydroxy acid?

Accepted Answer

A hydroxyl group on the carbon adjacent to the carboxyl group

Question 10

Which of the following reactions represents the esterification of propanoic acid with methanol?

Accepted Answer

$$\mathrm{CH_3CH_2COOH + CH_3OH \xrightarrow{H^+} CH_3CH_2COOCH_3 + H_2O}$$

Question 11

Which of the following best describes the products of the acid hydrolysis of methyl acetate?

Accepted Answer

Acetic acid and methanol

Question 12

Which of the following is the correct equation for the base hydrolysis (saponification) of ethyl acetate with sodium hydroxide?

Accepted Answer

$$\mathrm{CH_3COOCH_2CH_3 + NaOH \rightarrow CH_3COONa + CH_3CH_2OH}$$

Question 13

Which of the following compounds is responsible for the flavor of bananas?

Accepted Answer

Pentyl ethanoate

Question 14

Which of the following statements about the solubility of carboxylic acids in water is correct?

Accepted Answer

Carboxylic acids with 1-5 carbon atoms are very soluble in water.

Question 15

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

Accepted Answer

Benzoic acid

Question 16

A student is asked to draw the structure of 4-chlorohexanoic acid. Which of the following best describes the correct placement of the chlorine atom?

Accepted Answer

On the fourth carbon atom, counting from the carboxyl group

Question 17

Which of the following best describes the role of carboxylic acid salts in food?

Accepted Answer

They are used as preservatives and flavor enhancers.

Question 18

Which of the following is the correct IUPAC name for the ester formed from ethanol and propanoic acid?

Accepted Answer

Ethyl propanoate

Question 19

Which of the following best explains why aspirin is classified as an ester?

Accepted Answer

It is formed by replacing the -OH group of salicylic acid with an acetyl group.

Carboxylic Acids and Esters: Structure, Properties, and Reactions

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