Question 1

Which of the following statements best explains why carboxylic acids with fewer than 5 carbon atoms are highly soluble in water?

Accepted Answer

They form hydrogen bonds with water due to their polar carboxyl and hydroxyl groups.

Question 2

Which compound is formed when butan-1-ol is oxidized first to an aldehyde and then further oxidized?

Accepted Answer

Butanoic acid ($$\mathrm{CH_3CH_2CH_2COOH})$$

Question 3

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH_2CH_2COOH}$$?

Accepted Answer

Butanoic acid

Question 4

Which of the following best describes the process of saponification?

Accepted Answer

The hydrolysis of a triglyceride with a strong base to produce glycerol and the sodium salt of a fatty acid.

Question 5

Which structural feature distinguishes an ester from a carboxylic acid?

Accepted Answer

An ester has a carbonyl group bonded to a second oxygen atom, which is bonded to another carbon atom.

Question 6

Which of the following reactions is represented by the equation: $$\mathrm{RCOOH + R'OH \xrightarrow{heat,\ conc.\ H_2SO_4} RCOOR' + H_2O}$$?

Accepted Answer

Esterification

Question 7

Which of the following best explains why saturated fats are solid at room temperature, while unsaturated fats with cis double bonds are liquid?

Accepted Answer

Saturated fats have flexible chains that pack tightly, maximizing van der Waals interactions and raising melting points.

Question 8

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

Accepted Answer

Ethyl methanoate

Question 9

Which of the following is a correct balanced equation for the combustion of ethanoic acid ($$\mathrm{CH_3COOH}$$)?

Accepted Answer

$$\mathrm{CH_3COOH + 2\ O_2$ \rightarrow 2\ CO_2$ + 2\ H_2O}$$

Question 10

Which of the following statements about the melting points of carboxylic acids and alkanes is correct?

Accepted Answer

Carboxylic acids have higher melting points than alkanes due to dipole interactions and hydrogen bonding.

Question 11

Which of the following is the correct structural formula for octanoic acid?

Accepted Answer

$$\mathrm{CH_3$(CH_2$)_6COOH}$$

Question 12

Which of the following best describes the hydrolysis of an ester in a basic solution?

Accepted Answer

The ester splits into a carboxylic acid salt and an alcohol upon addition of water and base.

Question 13

Which of the following is the correct name for the compound with the structure $$\mathrm{CH_3CH_2COOCH_2CH_3}$$?

Accepted Answer

Ethyl propanoate

Question 14

Which of the following is a correct description of the esterification reaction used to synthesize octyl ethanoate?

Accepted Answer

Reacting octan-1-ol with ethanoic acid to produce octyl ethanoate and water.

Question 15

Which of the following best explains why esters have lower boiling points than carboxylic acids?

Accepted Answer

Esters do not form hydrogen bonds, so their intermolecular forces are weaker.

Question 16

Which of the following is the correct IUPAC name for the compound with two carboxyl groups on a two-carbon chain?

Accepted Answer

Ethanedioic acid

Question 17

Which of the following best describes the difference between cis and trans unsaturated fatty acids?

Accepted Answer

Cis fatty acids have kinks that prevent tight packing, lowering melting points; trans fatty acids are straighter and pack more tightly.

Question 18

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

Accepted Answer

Benzoic acid

Question 19

Which of the following is a correct description of a triglyceride?

Accepted Answer

An ester formed from glycerol and three long-chain fatty acids.

Lesson 1.6: Carboxylic Acids, Esters, and Fats: Structure, Properties, and Reactions

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