Question 1

Which of the following best describes the process of esterification?

Accepted Answer

The reaction of a carboxylic acid and an alcohol in the presence of an acid catalyst and heat to produce an ester.

Question 2

What is the IUPAC name for the ester with the following structure: $$\mathrm{CH_3CH_2COOCH_3}$$?

Accepted Answer

Methyl propanoate

Question 3

Which of the following statements about the boiling points of esters is correct?

Accepted Answer

Esters have boiling points higher than alkanes and ethers, but lower than alcohols and carboxylic acids of similar mass.

Question 4

Which of the following is a product of the acid hydrolysis of ethyl ethanoate ($$\mathrm{CH_3COOCH_2CH_3}) $$with water and an acid catalyst?

Accepted Answer

$$\mathrm{CH_3COOH} ($$ethanoic acid) and $$\mathrm{CH_3CH_2OH} ($$ethanol)

Question 5

Which of the following best explains why small esters are often used as flavoring agents in foods?

Accepted Answer

Small esters are volatile and soluble in water, allowing them to be easily smelled and tasted.

Question 6

What are the products of the base hydrolysis (saponification) of methyl propanoate ($$\mathrm{CH_3CH_2COOCH_3}) $$with NaOH?

Accepted Answer

$$\mathrm{CH_3CH_2COONa} ($$sodium propanoate) and $$\mathrm{CH_3OH} ($$methanol)

Question 7

Which of the following esters is responsible for the aroma and flavor of bananas?

Accepted Answer

Isoamyl acetate

Question 8

Aspirin is an ester formed from which two acids?

Accepted Answer

Salicylic acid and acetic acid

Question 9

Which of the following best describes the solubility of esters in water?

Accepted Answer

Esters with two to five carbon atoms are soluble in water; solubility decreases as the number of carbons increases.

Question 10

Which of the following is the correct balanced equation for the acid hydrolysis of methyl acetate ($$\mathrm{CH_3COOCH_3}$$)?

Accepted Answer

$$\mathrm{CH_3COOCH_3} + \mathrm{H_2O} \xrightarrow{H^+,\ heat} \mathrm{CH_3COOH} + \mathrm{CH_3OH}$$

Question 11

Which of the following statements about the hydrolysis of esters is correct?

Accepted Answer

Acid hydrolysis of esters produces a carboxylic acid and an alcohol.

Question 12

Which of the following is a correct description of saponification?

Accepted Answer

The reaction of an ester with a strong base to produce a carboxylate salt and an alcohol.

Question 13

Which of the following is the correct IUPAC name for the ester responsible for the flavor and odor of pears, with the structure $$\mathrm{CH_3COOCH_2CH_2CH_3}$$?

Accepted Answer

Propyl ethanoate

Question 14

Which of the following best explains why aspirin (acetylsalicylic acid) is less irritating to the stomach than salicylic acid?

Accepted Answer

The ester group in aspirin makes it less acidic and less irritating to the stomach lining.

Question 15

Which of the following is a correct statement about the hydrogen bonding ability of esters?

Accepted Answer

Esters cannot hydrogen bond to each other because they lack hydroxyl groups.

Carboxylic Acids and Esters: Structure, Properties, and Reactions

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