Question 1

Which of the following statements 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 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

Rank the following from most to least water soluble: carboxylic acid, ester, carboxylate salt.

Accepted Answer

Carboxylate salt \u003e Carboxylic acid \u003e Ester

Question 6

Which of the following best describes the reaction type when a carboxylic acid reacts with an alcohol to form an ester?

Accepted Answer

Condensation (esterification)

Question 7

Which of the following statements about amines is FALSE?

Accepted Answer

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

Question 8

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

Accepted Answer

$$8$$

Question 9

Which of the following is a property of amides that distinguishes them from amines?

Accepted Answer

Amides are not basic because the nitrogen lone pair is delocalized toward the carbonyl carbon.

Question 10

Which of the following is the correct product when a thiol is oxidized?

Accepted Answer

Disulfide

Question 11

Which intermolecular force is NOT present in thiols, but is present in alcohols?

Accepted Answer

Hydrogen bonding

Question 12

Which of the following best describes a phosphoanhydride bond?

Accepted Answer

A bond between two phosphate groups with a bridging oxygen

Question 13

What is the second product formed when ATP is hydrolyzed to ADP?

Accepted Answer

Phosphate ($$\mathrm{$$HPO_4$$^{2-}} or$$ $$\mathrm{PO_4$^{3-}})$$

Question 14

Which of the following functional groups is present in both DNA and RNA backbones?

Accepted Answer

Phosphoester

Question 15

Which of the following is a real-life application of saponification?

Accepted Answer

Making soap from animal fat and lye

Question 16

Which of the following best explains why amine salts are more water-soluble than neutral amines?

Accepted Answer

Amine salts are ionic and interact strongly with water molecules.

Question 17

Which of the following is a condensation reaction?

Accepted Answer

Esterification of a carboxylic acid with an alcohol

Question 18

Which of the following molecules is most likely to be found as a solid at room temperature due to strong intermolecular forces?

Accepted Answer

Carboxylic acid

Question 19

Which of the following is NOT a property of thiols?

Accepted Answer

They can form hydrogen bonds with each other.

Question 20

Which of the following best describes the role of ATP in phosphorylation reactions?

Accepted Answer

ATP provides a phosphate group and energy for the reaction.

Lecture 7: Carboxylic Acids; Nitrogen, Sulfur, and Phosphorus Compounds

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