Question 1

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

Accepted Answer

Carboxylic acids can form hydrogen bonds with each other, while esters cannot donate hydrogen bonds.

Question 2

A student mixes acetic acid ($$\mathrm{CH_3COOH}) $$with sodium hydroxide ($$\mathrm{NaOH}). $$What is the main product of this reaction?

Accepted Answer

Sodium acetate ($$\mathrm{CH_3COONa}) $$and water ($$\mathrm{H_2O})$$

Question 3

Which of the following functional groups is most oxidized?

Accepted Answer

Carboxylic acid

Question 4

Which property is shared by both primary amines and primary amides?

Accepted Answer

Both can act as hydrogen bond donors and acceptors.

Question 5

What is the main difference between the intermolecular forces in esters and carboxylic acids?

Accepted Answer

Esters have only dipole-dipole interactions, while carboxylic acids have hydrogen bonding.

Question 6

Which reaction is responsible for the formation of peptide bonds in proteins?

Accepted Answer

Condensation reaction between an amine and a carboxylic acid

Question 7

Which of the following statements about amines is correct?

Accepted Answer

Amines are weak bases and can accept a proton due to the lone pair on nitrogen.

Question 8

What is the result of hydrolyzing an ester with a strong base such as NaOH?

Accepted Answer

A carboxylate salt and an alcohol

Question 9

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP contains phosphoanhydride bonds that release energy when hydrolyzed.

Question 10

Which of the following is true about the solubility of amine salts compared to free amines?

Accepted Answer

Amine salts are more soluble in water because they are charged ions.

Question 11

Which of the following reactions is an example of saponification?

Accepted Answer

Hydrolysis of an ester with a base to produce a carboxylate salt and an alcohol

Question 12

Which functional group is present in acetyl-CoA and is important for metabolism?

Accepted Answer

Thioester

Question 13

What is the main product when a thiol reacts with a heavy metal ion such as $$\mathrm{Pb$$^{2+}$$}$$?

Accepted Answer

A metal-thiol complex and hydrogen ions

Question 14

Which of the following statements about amides is correct?

Accepted Answer

Amides are usually not basic because the nitrogen lone pair is attracted to the carbonyl carbon.

Question 15

Which of the following is a correct description of a phosphorylation reaction?

Accepted Answer

Transfer of a phosphate group from one molecule to another, often using ATP as the donor

Question 16

Which of the following is true about the hydrolysis of amides under acidic conditions?

Accepted Answer

It produces an amine salt and a carboxylic acid.

Question 17

Which of the following is a property of thiols that distinguishes them from alcohols?

Accepted Answer

Thiols have a characteristic 'skunky' smell due to the sulfur atom.

Question 18

Which of the following is true about the formation of disulfide bonds in proteins?

Accepted Answer

Disulfide bonds are formed by the oxidation of two cysteine thiol groups.

Question 19

Which of the following best explains why esters are more volatile than carboxylic acids?

Accepted Answer

Esters have weaker intermolecular forces because they cannot donate hydrogen bonds.

Carboxylic Acids, Esters, Amines, Amides, Thiols, Disulfides, and Phosphates: Structure, Properties, and Reactions

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