Question 1

Which of the following best explains why carboxylic acids generally have higher boiling points than esters of similar molecular weight?

Accepted Answer

Carboxylic acids can form both hydrogen bond donors and acceptors, leading to strong intermolecular hydrogen bonding.

Question 2

A protein contains a carboxylic acid group with a pKa of 4.1. At which pH will this group be mostly deprotonated and negatively charged?

Accepted Answer

$$6$$

Question 3

Which of the following is the correct balanced equation for the neutralization of acetic acid ($$\mathrm{CH_3COOH}) $$with potassium hydroxide ($$\mathrm{KOH}$$)?

Accepted Answer

$$\mathrm{CH_3COOK + H_2O}$$

Question 4

Which of the following compounds is the strongest acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 5

Which of the following is the correct order of water solubility for the following compounds: carboxylic acid, ester, carboxylate salt?

Accepted Answer

Carboxylate salt $$\u003e$$ Carboxylic acid $$\u003e$$ Ester

Question 6

Which of the following statements about amines is FALSE?

Accepted Answer

Amines are generally more water-soluble than their corresponding amine salts.

Question 7

A protein contains an amine group with a pKa of 9.9. At which pH will this group be mostly protonated and positively charged?

Accepted Answer

$$8$$

Question 8

Which of the following best describes the difference between an amide and an amine?

Accepted Answer

Amides contain a carbonyl group directly bonded to nitrogen, while amines do not.

Question 9

Which of the following molecules is basic?

Accepted Answer

$$\mathrm{NH_2$}$$

Question 10

Which of the following is a product of the base hydrolysis (saponification) of a triacylglycerol?

Accepted Answer

Carboxylate salt (soap)

Question 11

Which of the following best explains why thiols have lower boiling points than alcohols of similar molecular weight?

Accepted Answer

Thiols cannot form hydrogen bonds due to the larger size of sulfur.

Question 12

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

Accepted Answer

A thioester contains a carbonyl group bonded to a sulfur atom.

Question 13

Which of the following is a phosphoanhydride bond?

Accepted Answer

A bond between two phosphate groups with a bridging oxygen ($$\mathrm{P-O-P})$$

Question 14

What is the second product of ATP hydrolysis?

Accepted Answer

Phosphate ($$\mathrm{$$HPO_4$$^{2-}})$$

Question 15

Which of the following best describes the role of phosphorylation in metabolism?

Accepted Answer

It transfers a phosphate group from ATP to another molecule, often activating or deactivating the molecule.

Question 16

Which of the following statements about amide hydrolysis is correct?

Accepted Answer

Acidic hydrolysis of an amide produces a carboxylic acid and an amine salt.

Question 17

Which intermolecular force is primarily responsible for the high solubility of amine salts in water?

Accepted Answer

Ionic interactions

Question 18

Which of the following is a real-life application of the formation of disulfide bonds?

Accepted Answer

Stabilization of protein tertiary and quaternary structure (e.g., in hair keratin)

Question 19

Which of the following best explains why amides are not basic, unlike amines?

Accepted Answer

The nitrogen lone pair in amides is delocalized toward the carbonyl carbon, reducing its ability to accept protons.

Carboxylic Acids and N-, S-, and P-Containing Compounds: Structure, Properties, and Biological Relevance

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