Question 1

Which of the following best explains why carboxylic acids such as acetic acid have higher boiling points than alcohols of similar molecular weight?

Accepted Answer

Carboxylic acids form hydrogen-bonded dimers, effectively doubling their molecular weight and increasing intermolecular forces.

Question 2

What is the effect of substituting hydrogen atoms on the alpha carbon of acetic acid with chlorine atoms on its acidity?

Accepted Answer

It increases the acidity by stabilizing the conjugate base through electron withdrawal.

Question 3

Which of the following reactions represents the formation of a water-soluble salt from benzoic acid?

Accepted Answer

$$\mathrm{C_6H_5COOH} + \mathrm{NaOH} \rightarrow \mathrm{C_6H_5COO^-Na^+} + \mathrm{H_2O}$$

Question 4

Which of the following best describes the process of decarboxylation?

Accepted Answer

Loss of a carbon dioxide molecule ($$\mathrm{CO_2$}) $$from a carboxylic acid, usually at high temperature.

Question 5

Why do $$\beta-$$ketoacids undergo decarboxylation more readily at lower temperatures compared to simple carboxylic acids?

Accepted Answer

Because the $$\beta-$$keto group stabilizes the transition state via resonance and enol formation.

Question 6

Which of the following is the correct product of the reduction of acetic acid ($$\mathrm{CH_3COOH}) $$with lithium aluminum hydride ($$\mathrm{$$LiAlH_4$$}$$)?

Accepted Answer

$$\mathrm{CH_3CH_2OH} ($$ethanol)

Question 7

Which of the following best describes the role of concentrated sulfuric acid in Fischer esterification?

Accepted Answer

It acts as a catalyst by protonating the carbonyl oxygen, increasing the electrophilicity of the carbonyl carbon.

Question 8

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

Accepted Answer

Ester hydrolysis requires either a strong acid or a strong base to proceed at a reasonable rate.

Question 9

Which of the following is a correct representation of the reaction between acetic anhydride and ethanol?

Accepted Answer

$$\mathrm{CH_3COOCOCH_3} + \mathrm{CH_3CH_2OH} \rightarrow \mathrm{CH_3COOCH_2CH_3} + \mathrm{CH_3COOH}$$

Question 10

Which of the following best explains why trichloroacetic acid is a much stronger acid than acetic acid?

Accepted Answer

The three chlorine atoms withdraw electron density, stabilizing the conjugate base.

Question 11

Which of the following is a correct description of a carboxylic acid anhydride?

Accepted Answer

It is formed by the condensation of two carboxylic acids with the loss of water.

Question 12

Which of the following best describes the structure of a hydrogen-bonded dimer of acetic acid?

Accepted Answer

Two acetic acid molecules are held together by two hydrogen bonds between their carboxyl groups.

Question 13

Which of the following is a correct statement about the hydrolysis of acetic anhydride?

Accepted Answer

$$\mathrm{CH_3COOCOCH_3} + \mathrm{H_2O} \rightarrow 2\ \mathrm{CH_3COOH}$$

Question 14

Which of the following best describes a lactone?

Accepted Answer

A cyclic ester formed by the intramolecular reaction of a hydroxy acid.

Question 15

Which of the following statements about the solubility of carboxylic acids and their salts is correct?

Accepted Answer

Carboxylic acid salts are generally much more water-soluble than the corresponding acids.

Question 16

Which of the following is a correct statement about the hydrolysis of esters under acidic conditions?

Accepted Answer

It is a reversible reaction that produces a carboxylic acid and an alcohol.

Carboxylic Acids and Esters: Structure, Properties, and Reactions

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