Question 1

Which of the following species is the conjugate base of methanol, CH3OH?

Accepted Answer

A) CH3OH2+ 
B) CH3O- 
C) CH3- 
D) CH4 
A) CH3OH2+ 
B) CH3O- 
C) CH3- 
D) CH4

Question 2

Which is the conjugate base in the following reaction?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 3

Which of the following species is the conjugate acid of ammonia, NH3?

Accepted Answer

A) H4N 
B) H3N+ 
C) H2N- 
D) H4N+ 
A) H4N 
B) H3N+ 
C) H2N- 
D) H4N+

Question 4

Rank the following compounds in order of decreasing acidity, putting the most acidic first.

Accepted Answer

A) IV > II > III > I 
B) IV > III > II > I 
C) III > IV > II > I 
D) III > IV > I > II 
A) IV > II > III > I 
B) IV > III > II > I 
C) III > IV > II > I 
D) III > IV > I > II

Question 5

Which of the following statements about Lewis acids is true?

Accepted Answer

A) Lewis acids are proton donors. 
B) Lewis acids are proton acceptors. 
C) Lewis acids are electron pair donors. 
D) Lewis acids are electron pair acceptors. 
A) Lewis acids are proton donors. 
B) Lewis acids are proton acceptors. 
C) Lewis acids are electron pair donors. 
D) Lewis acids are electron pair acceptors.

Question 6

Rank the following compounds in order of increasing acidity, putting the least acidic first.

Accepted Answer

A) III < I < IV < II 
B) III < IV < I < II 
C) II < I < IV < III 
D) III < I < II < IV 
A) III < I < IV < II 
B) III < IV < I < II 
C) II < I < IV < III 
D) III < I < II < IV

Question 7

Rank the following compounds in order of decreasing acidity, putting the most acidic first.

Accepted Answer

A) I > II > III 
B) III > II > I 
C) II > III > I 
D) III > I > II 
A) I > II > III 
B) III > II > I 
C) II > III > I 
D) III > I > II

Question 8

Identify the Lewis base in the following reaction.

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 9

Which of the following statements is a correct definition for a Brønsted-Lowry acid?

Accepted Answer

A) Proton acceptor 
B) Electron pair donor 
C) Electron pair acceptor 
D) Proton donor 
A) Proton acceptor 
B) Electron pair donor 
C) Electron pair acceptor 
D) Proton donor

Question 10

Identify the Lewis acid in the following reaction.

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 11

Rank the following conjugate bases in order of decreasing basicity, putting the most basic first.

Accepted Answer

A) II > I > III 
B) I > II > III 
C) III > I > II 
D) III > II > I 
A) II > I > III 
B) I > II > III 
C) III > I > II 
D) III > II > I

Question 12

Which of the following statements explain why HBr is a stronger acid than HF?

Accepted Answer

A) Br- is more stable than F- because Br- is larger than F-. 
B) Br- is less stable than F- because Br- is larger than F-. 
C) Br- is more stable than F- because Br- is less electronegative than F-. 
D) Br- is less stable than F- because Br- is less electronegative than F-. 
A) Br- is more stable than F- because Br- is larger than F-. 
B) Br- is less stable than F- because Br- is larger than F-. 
C) Br- is more stable than F- because Br- is less electronegative than F-. 
D) Br- is less stable than F- because Br- is less electronegative than F-.

Question 13

Which of the following compounds is the weakest acid?

Accepted Answer

A) H2S 
B) PH3 
C) HCl 
D) SiH4 
A) H2S 
B) PH3 
C) HCl 
D) SiH4

Question 14

Which of the following statements about acid strength is true?

Accepted Answer

A) The stronger the acid, the further the equilibrium lies to the left. 
B) The stronger the acid, the smaller the Ka. 
C) The stronger the acid, the larger the pKa. 
D) The stronger the acid, the smaller the pKa. 
A) The stronger the acid, the further the equilibrium lies to the left. 
B) The stronger the acid, the smaller the Ka. 
C) The stronger the acid, the larger the pKa. 
D) The stronger the acid, the smaller the pKa.

Question 15

Which of the following statements about a Brønsted-Lowry base is true?

Accepted Answer

A) The net charge may be zero, positive, or negative. 
B) All Brønsted-Lowry bases contain a lone pair of electrons or a π bond. 
C) All Brønsted-Lowry bases contain a proton. 
D) The net charge may be zero or positive. 
A) The net charge may be zero, positive, or negative. 
B) All Brønsted-Lowry bases contain a lone pair of electrons or a π bond. 
C) All Brønsted-Lowry bases contain a proton. 
D) The net charge may be zero or positive.

Question 16

Which of the following is the strongest base?

Accepted Answer

A) CH3COCH3 
B) CH3COOH 
C) NH3 
D) H2O 
A) CH3COCH3 
B) CH3COOH 
C) NH3 
D) H2O

Question 17

Which of the following concepts can be used to explain the difference in acidity between acetylene (C2H2) and ethylene (C2H4)?

Accepted Answer

A) Size 
B) Resonance 
C) Inductive effect 
D) Hybridization 
A) Size 
B) Resonance 
C) Inductive effect 
D) Hybridization

Question 18

Which of the following is a Lewis acid but not a Brønsted-Lowry acid?

Accepted Answer

A) CH3OH 
B) H2O 
C) CH3COOH 
D) BF3 
A) CH3OH 
B) H2O 
C) CH3COOH 
D) BF3

Question 19

What is the correct classification of the following compound? CH3-O-CH3

Accepted Answer

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

Question 20

Which of the following species is the conjugate base of the hydronium ion, H3O+?

Accepted Answer

A) H3O 
B) H2O- 
C) H2O 
D) HO- 
A) H3O 
B) H2O- 
C) H2O 
D) HO-

Exam 2: Acids and Bases

Which of the following species is the conjugate base of methanol, CH3OH?

Which is the conjugate base in the following reaction?

Which of the following species is the conjugate acid of ammonia, NH3?

Rank the following compounds in order of decreasing acidity, putting the most acidic first.

Which of the following statements about Lewis acids is true?

Rank the following compounds in order of increasing acidity, putting the least acidic first.

Rank the following compounds in order of decreasing acidity, putting the most acidic first.

Identify the Lewis base in the following reaction.

Which of the following statements is a correct definition for a Brønsted-Lowry acid?

Identify the Lewis acid in the following reaction.

Rank the following conjugate bases in order of decreasing basicity, putting the most basic first.

Which of the following statements explain why HBr is a stronger acid than HF?

Which of the following compounds is the weakest acid?

Which of the following statements about acid strength is true?

Which of the following statements about a Brønsted-Lowry base is true?

Which of the following is the strongest base?

Which of the following concepts can be used to explain the difference in acidity between acetylene (C2H2) and ethylene (C2H4)?

Which of the following is a Lewis acid but not a Brønsted-Lowry acid?

What is the correct classification of the following compound? CH3-O-CH3

Which of the following species is the conjugate base of the hydronium ion, H3O+?

Structure and Bonding

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers, and Related Compounds

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry;

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Filters

Which of the following species is the conjugate base of methanol, CH₃OH?

Which of the following species is the conjugate acid of ammonia, NH₃?

Which of the following concepts can be used to explain the difference in acidity between acetylene (C₂H₂) and ethylene (C₂H₄)?

What is the correct classification of the following compound? CH₃-O-CH₃

Which of the following species is the conjugate base of the hydronium ion, H₃O⁺?