Question 1

Which of the following energy diagrams best represents the changes in energy during addition of HBr to an alkene?

Accepted Answer

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

Question 2

Which of the following terms describes the reactivity of trimethylamine, (CH3)3N?

Accepted Answer

A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base 
A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base B

Question 3

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 B

Question 4

Which set of curved arrows accounts for the deprotonation of an acid (A-H) by a base (:B)?

Accepted Answer

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

Question 5

Which of the following is a feature of a Brønsted-Lowry 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 6

Which of the following is the strongest base?

Accepted Answer

A)  NaOH 
B)  NaCO3 
C)  H2O 
D)  CH3OH 
A)  NaOH 
B)  NaCO3 
C)  H2O 
D)  CH3OH

Question 7

Which of the following is present in the highest concentration upon dissolution of acetic acid in water?

Accepted Answer

A)  OH- 
B)  H3O+ 
C)  CH3COOH 
D)  CH3COOH+ 
A)  OH- 
B)  H3O+ 
C)  CH3COOH 
D)  CH3COOH+

Question 8

Which of the following is a definition of the activation energy of a reaction?

Accepted Answer

A)  the difference in Gibbs free energy between the reactants and the transition state 
B)  the difference in Gibbs free energy between the reactants and the intermediate 
C)  the difference in Gibbs free energy between the reactants and the product 
D)  the difference in Gibbs free energy between the transition state and the product 
A)  the difference in Gibbs free energy between the reactants and the transition state 
B)  the difference in Gibbs free energy between the reactants and the intermediate 
C)  the difference in Gibbs free energy between the reactants and the product 
D)  the difference in Gibbs free energy between the transition state and the product

Question 9

Use curved arrows to show the movement of pairs of electrons in the following reaction between a Lewis acid and a Lewis base, and show the structure of the product.

Accepted Answer

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

Question 10

Which species is the conjugate acid in the following acid-base reaction?

Accepted Answer

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

Question 11

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

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 12

Which of the following terms describes the reactivity of boron tribromide, BBr3?

Accepted Answer

A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base 
A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base

Question 13

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 14

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 15

Which of the following has a pKa value of approximately 16?

Accepted Answer

A)  HBr 
B)  CH3COOH 
C)  CH3CH2OH 
D)  HCºCH 
A)  HBr 
B)  CH3COOH 
C)  CH3CH2OH 
D)  HCºCH

Question 16

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 17

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 18

Which of the following is easiest to deprotonate?

Accepted Answer

A)  CH4 
B)  CH3CH3 
C)  CH2=CH2 
D)  HCºCH 
A)  CH4 
B)  CH3CH3 
C)  CH2=CH2 
D)  HCºCH

Question 19

What is the value of the equilibrium constant for the following equilibrium?

Accepted Answer

log₁₀K_eq = pK_a(acid) - pK

Question 20

Under which of the following conditions will a reaction be spontaneous when DH$\degree$ > 0?

Accepted Answer

A) TDS$\degree$ = 0 B) -TDS$\degree$ > DH$\degree$ C) TDS$\degree$< 0$\degree$ D) DG$\degree$ = 0 A) TDS$\degree$ = 0 B) -TDS$\degree$ > DH$\degree$ C) TDS$\degree$< 0$\degree$ D) DG$\degree$ = 0

Exam 4: Acids and Bases

Which of the following energy diagrams best represents the changes in energy during addition of HBr to an alkene?

Which of the following terms describes the reactivity of trimethylamine, (CH3)3N?

What is the approximate pKa value of acetic acid?

Which set of curved arrows accounts for the deprotonation of an acid (A-H) by a base (:B)?

Which of the following is a feature of a Brønsted-Lowry base?

Which of the following is the strongest base?

Which of the following is present in the highest concentration upon dissolution of acetic acid in water?

Which of the following is a definition of the activation energy of a reaction?

Use curved arrows to show the movement of pairs of electrons in the following reaction between a Lewis acid and a Lewis base, and show the structure of the product.

Which species is the conjugate acid in the following acid-base reaction?

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

Which of the following terms describes the reactivity of boron tribromide, BBr3?

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

Which of the following compounds has the lowest pKa?

Which of the following has a pKa value of approximately 16?

Which of the following energy diagrams represents the slowest reaction?

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

Which of the following is easiest to deprotonate?

What is the value of the equilibrium constant for the following equilibrium?

Under which of the following conditions will a reaction be spontaneous when DH °\degree° > 0?

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

Filters

Which of the following terms describes the reactivity of trimethylamine, (CH₃)₃N?

What is the approximate pK_a value of acetic acid?

Which of the following terms describes the reactivity of boron tribromide, BBr₃?

Which of the following compounds has the lowest pK_a?

Which of the following has a pK_a value of approximately 16?

Under which of the following conditions will a reaction be spontaneous when DH $\degree$ > 0?