Question 1

Which structural feature distinguishes carboxylic acids from other organic acids?

Accepted Answer

A hydroxyl group bonded directly to a carbonyl group

Question 2

Why are carboxylic acids generally considered weak acids?

Accepted Answer

Because their conjugate base is stabilized by resonance

Question 3

Which of the following acids is expected to be the strongest, and why?

Accepted Answer

2,2,2-Trifluoroethanoic acid, because the F atoms stabilize the carboxylate anion via inductive effect

Question 4

What is the main reason carboxylic acids are stronger acids than alcohols?

Accepted Answer

Resonance stabilization of the carboxylate anion

Question 5

Given the reaction: $\mathrm{CH_3COOH + H_2O \rightarrow CH_3COO^- + H_3O^+}$, what is the role of water?

Accepted Answer

Water acts as a base, accepting a proton from acetic acid

Question 6

Which product is formed when benzoic acid reacts with aqueous NaOH?

Accepted Answer

Sodium benzoate and water

Question 7

What is the product of the reaction between propanoic acid and NaOH?

Accepted Answer

Sodium propanoate and water

Question 8

Which type of reaction is responsible for the formation of esters from carboxylic acids and alcohols?

Accepted Answer

Esterification

Question 9

What is the general equation for esterification?

Accepted Answer

$\mathrm{RCOOH + R'OH \rightarrow RCOOR' + H_2O}$

Question 10

Which ester is responsible for the banana flavor?

Accepted Answer

Pentyl acetate

Question 11

What is the product of saponification of methyl propionate with NaOH?

Accepted Answer

Sodium propionate and methanol

Question 12

Which reagent is commonly used to convert a carboxylic acid to an acid chloride?

Accepted Answer

Thionyl chloride ($\mathrm{SOCl_2}$)

Question 13

Which of the following is a carboxylic acid derivative?

Accepted Answer

Acid chloride

Question 14

What is the main difference between an ester and an acid anhydride?

Accepted Answer

An ester has an alkoxy group, while an acid anhydride has two acyl groups joined by an oxygen atom

Question 15

Which of the following statements about the inductive effect in carboxylic acids is correct?

Accepted Answer

Electron-withdrawing groups on the α-carbon increase acidity by stabilizing the carboxylate anion

Question 16

Which of the following reactions is an example of hydrolysis?

Accepted Answer

$\mathrm{RCOOR' + NaOH \rightarrow RCOO^-Na^+ + R'OH}$

Question 17

A student mixes acetic acid and ethanol in the presence of sulfuric acid. What is the major organic product?

Accepted Answer

Ethyl acetate

Question 18

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

Accepted Answer

The three fluorine atoms withdraw electron density, stabilizing the carboxylate anion

Question 19

Which of the following is a correct statement about the resonance stabilization of carboxylate ions?

Accepted Answer

The negative charge is delocalized over both oxygen atoms

Question 20

Which of the following is a real-world application of esters?

Accepted Answer

They are used as flavoring agents in foods and perfumes

Carboxylic Acids and Their Derivatives: Structure, Properties, and Reactions

Study Guide - Practice Questions