Question 1

Which of the following energy diagrams represents the slowest reaction?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 2

Consider the following reaction coordinate diagram.   The transition state is represented by the letter B.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following compounds is the strongest acid?

Accepted Answer

A)  CH3COOH 
B)  FCH2COOH 
C)  ClCH2COOH 
D)  BrCH2COOH 
A)  CH3COOH 
B)  FCH2COOH 
C)  ClCH2COOH 
D)  BrCH2COOH

Question 4

Which of the following is a feature of a Lewis base?

Accepted Answer

A)  proton donor 
B)  proton acceptor 
C)  electron pair donor 
D)  electron pair acceptor 
A)  proton donor 
B)  proton acceptor 
C)  electron pair donor 
D)  electron pair acceptor

Question 5

Which of the following is a definition of the rate-determining step of a reaction mechanism?

Accepted Answer

A)  the first step 
B)  the last step 
C)  the step that crosses the highest energy barrier 
D)  the most exothermic step 
A)  the first step 
B)  the last step 
C)  the step that crosses the highest energy barrier 
D)  the most exothermic step

Question 6

Which of the following concepts can be used to rationalize the observation that acetic acid is a stronger acid than methanol?

Accepted Answer

A)  electronegativity 
B)  resonance 
C)  valence shell electron pair repulsion theory 
D)  Pauli exclusion principle 
A)  electronegativity 
B)  resonance 
C)  valence shell electron pair repulsion theory 
D)  Pauli exclusion principle

Question 7

The structure of the alkaloid ephedrine is shown below. When ephedrine is placed in the presence of an acid, the -OH group will be protonated.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following terms describes the role of ethanol in the acid-base reaction shown?

Accepted Answer

A)  Brønsted-Lowry acid 
B)  Brønsted-Lowry base 
C)  Lewis acid 
D)  Lewis base 
A)  Brønsted-Lowry acid 
B)  Brønsted-Lowry base 
C)  Lewis acid 
D)  Lewis base

Question 9

Match the types of reactions with the most appropriate relationships.
-ΔGproduct reactant

Accepted Answer

A) Exergonic Reaction 
B) Endergonic Reaction 
C) Exothermic Reaction 
D) Endothermic Reaction 
A) Exergonic Reaction 
B) Endergonic Reaction 
C) Exothermic Reaction 
D) Endothermic Reaction

Question 10

Which of the following has the highest bond dissociation energy?

Accepted Answer

A)  HF 
B)  HCl 
C)  HBr 
D)  HI 
A)  HF 
B)  HCl 
C)  HBr 
D)  HI

Question 11

Which of the following energy diagrams represents the fastest reaction?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 12

Which of the following statements is not true?

Accepted Answer

A)  The position of the equilibrium for an exergonic reaction favors products 
B)  The products of an exergonic reaction have a higher Gibbs free energy than the reactants. 
C)  The equilibrium constant of a reaction for which ΔG° = 0 is 1. 
D)  ΔG° = ΔH° − TΔS° 
A)  The position of the equilibrium for an exergonic reaction favors products 
B)  The products of an exergonic reaction have a higher Gibbs free energy than the reactants. 
C)  The equilibrium constant of a reaction for which ΔG° = 0 is 1. 
D)  ΔG° = ΔH° − TΔS°

Question 13

The pKa of HCl is ?7. What is the value of the equilibrium constant, Keq, for the following equilibrium? [The concentration of water in a dilute aqueous solution is 55 M] $\mathrm{HCl}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{\oplus}+\mathrm{Cl}^{\ominus}$

Accepted Answer

A)  1.8 × 105 
B)  385 
C)  1.8 × 10?5 
D)  ?1.8 × 105 
A)  1.8 × 105 
B)  385 
C)  1.8 × 10?5 
D)  ?1.8 × 105

Question 14

Which of the following compounds is the strongest acid?

Accepted Answer

A)  HF 
B)  H2O 
C)  NH3 
D)  CH4 
A)  HF 
B)  H2O 
C)  NH3 
D)  CH4

Question 15

Which of the following compounds has the lowest pKa?

Accepted Answer

A)  H2O 
B)  H2S 
C)  H2Se 
D)  H2Te 
A)  H2O 
B)  H2S 
C)  H2Se 
D)  H2Te

Question 16

Which of the following compounds is the strongest acid?

Accepted Answer

A)  CH3COOH 
B)  ClCH2COOH 
C)  CH3CH2OH 
D)  ClCH2CH2OH 
A)  CH3COOH 
B)  ClCH2COOH 
C)  CH3CH2OH 
D)  ClCH2CH2OH

Question 17

Indole is pleasant smelling in highly dilute solutions and has been used in perfumery.   When indole is placed in the presence of a strong base the nitrogen atom will be deprotonated.

Accepted Answer

A) True 
 B)False

Question 18

Match the types of reactions with the most appropriate relationships.
-ΔHproduct reactant

Accepted Answer

A) Exergonic Reaction 
B) Endergonic Reaction 
C) Exothermic Reaction 
D) Endothermic Reaction 
A) Exergonic Reaction 
B) Endergonic Reaction 
C) Exothermic Reaction 
D) Endothermic Reaction

Question 19

Use curved arrows to show the movement of pairs of electrons in the following acid-base reaction and show the structures of the conjugate acid and conjugate base.

Accepted Answer

The answer of Use curved arrows to show the movement...

Question 20

What is the approximate pKa value of acetic acid?

Accepted Answer

A)  −7 
B)  5 
C)  16 
D)  51 
A)  −7 
B)  5 
C)  16 
D)  51

Exam 4: Acids and Bases

Which of the following energy diagrams represents the slowest reaction?

Consider the following reaction coordinate diagram. The transition state is represented by the letter B.

Which of the following compounds is the strongest acid?

Which of the following is a feature of a Lewis base?

Which of the following is a definition of the rate-determining step of a reaction mechanism?

Which of the following concepts can be used to rationalize the observation that acetic acid is a stronger acid than methanol?

The structure of the alkaloid ephedrine is shown below. When ephedrine is placed in the presence of an acid, the -OH group will be protonated.

Which of the following terms describes the role of ethanol in the acid-base reaction shown?

Match the types of reactions with the most appropriate relationships. -ΔGproduct < ΔGreactant

Which of the following has the highest bond dissociation energy?

Which of the following energy diagrams represents the fastest reaction?

Which of the following statements is not true?

Which of the following compounds is the strongest acid?

Which of the following compounds has the lowest pKa?

Which of the following compounds is the strongest acid?

Indole is pleasant smelling in highly dilute solutions and has been used in perfumery. When indole is placed in the presence of a strong base the nitrogen atom will be deprotonated.

Match the types of reactions with the most appropriate relationships. -ΔHproduct < ΔHreactant

Use curved arrows to show the movement of pairs of electrons in the following acid-base reaction and show the structures of the conjugate acid and conjugate base.

What is the approximate pKa value of acetic acid?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

Match the types of reactions with the most appropriate relationships. -ΔG_product < ΔG_reactant

Which of the following compounds has the lowest pK_a?

Match the types of reactions with the most appropriate relationships. -ΔH_product < ΔH_reactant

What is the approximate pK_a value of acetic acid?