Question 1

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 2

Identify the acid/conjugate acid (in that order)in the following reaction:

Accepted Answer

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

Question 3

Which of the following species can be both Lewis acid and Lewis base?

Accepted Answer

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

Question 4

Which of the following ranks the compounds in order of increasing basicity,putting the least basic first?

Accepted Answer

A) CH3NH2 3OH 4 
B) CH3OH 3NH2 4 
C) CH4 3NH2 3OH 
D) CH4 3OH 3NH2 
A) CH3NH2 3OH 4 
B) CH3OH 3NH2 4 
C) CH4 3NH2 3OH 
D) CH4 3OH 3NH2

Question 5

Which of the following statements about Brønsted-Lowry acids and bases is true?

Accepted Answer

A) Loss of a proton from a base forms its conjugate acid. 
B) Loss of a proton from an acid forms its conjugate base. 
C) Gain of a proton by an acid forms its conjugate base. 
D) Brønsted-Lowry acid-base reactions always result in the transfer of a proton from a base to an acid. 
A) Loss of a proton from a base forms its conjugate acid. 
B) Loss of a proton from an acid forms its conjugate base. 
C) Gain of a proton by an acid forms its conjugate base. 
D) Brønsted-Lowry acid-base reactions always result in the transfer of a proton from a base to an acid.

Question 6

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 7

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 8

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 9

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 10

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 11

Consider the following structures I-IV.Which two species represent a conjugate acid-base pair?

Accepted Answer

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

Question 12

Which of the following compounds is not a Lewis acid?

Accepted Answer

A) AlCl3 
B) HCl 
C) H2O 
D) CBr4 
A) AlCl3 
B) HCl 
C) H2O 
D) CBr4

Question 13

What is the electrophilic site in the following compounds?

Accepted Answer

A) I = Carbon; II = carbon; III = boron. 
B) I = Chlorine; II = carbon; III = boron. 
C) I = Carbon; II = oxygen; III = boron. 
D) I = Carbon; II = carbon; III = fluorine. 
A) I = Carbon; II = carbon; III = boron. 
B) I = Chlorine; II = carbon; III = boron. 
C) I = Carbon; II = oxygen; III = boron. 
D) I = Carbon; II = carbon; III = fluorine.

Question 14

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

Accepted Answer

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

Question 15

Which of the following species is the strongest base?

Accepted Answer

A) HO- 
B) H2N- 
C) CH3COO- 
D) Cl- 
A) HO- 
B) H2N- 
C) CH3COO- 
D) Cl-

Question 16

Consider the following structures I-IV.Which two species represent resonance structures?

Accepted Answer

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

Question 17

Which is the conjugate acid in the following reaction?

Accepted Answer

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

Question 18

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 19

Which of the following would have the lowest pKa?

Accepted Answer

A) ClCH2CH2CH2CH2COOH 
B) CH3CHClCH2CH2COOH 
C) CH3CH2CHClCH2COOH 
D) CH3CH2CH2CHClCOOH 
A) ClCH2CH2CH2CH2COOH 
B) CH3CHClCH2CH2COOH 
C) CH3CH2CHClCH2COOH 
D) CH3CH2CH2CHClCOOH

Exam 2: Acids and Bases

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

Identify the acid/conjugate acid (in that order)in the following reaction:

Which of the following species can be both Lewis acid and Lewis base?

Which of the following ranks the compounds in order of increasing basicity,putting the least basic first?

Which of the following statements about Brønsted-Lowry acids and bases is true?

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

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

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

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

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

Consider the following structures I-IV.Which two species represent a conjugate acid-base pair?

Which of the following compounds is not a Lewis acid?

What is the electrophilic site in the following compounds?

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

Which of the following species is the strongest base?

Consider the following structures I-IV.Which two species represent resonance structures?

Which is the conjugate acid in the following reaction?

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

Which of the following would have the lowest pKa?

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 and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Conjugation,resonance,and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Spectroscopy A: Mass Spectrometry

Spectroscopy B: Infrared Spectroscopy

Spectroscopy C: Nuclear Magnetic Resonance Spectroscopy

Filters

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

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