Question 1

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 2

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 3

Which of the following statements explains why H2O is a stronger acid than CH4?

Accepted Answer

A) H2O can form hydrogen bonds while CH4 cannot. 
B) H2O forms a less stable conjugate base, HO-. 
C) CH4 forms a more stable conjugate base, CH3-. 
D) H2O forms a more stable conjugate base, HO-. 
A) H2O can form hydrogen bonds while CH4 cannot. 
B) H2O forms a less stable conjugate base, HO-. 
C) CH4 forms a more stable conjugate base, CH3-. 
D) H2O forms a more stable conjugate base, HO-.

Question 4

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 5

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 6

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 7

Which of the following compounds is the weakest acid?

Accepted Answer

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

Question 8

What is the nucleophilic site in the following compounds?

Accepted Answer

A) I = Hydrogen; II = π electrons in bond; III = nitrogen. 
B) I = Oxygen; II = carbon; III = nitrogen. 
C) I = Hydrogen; II = carbon; III = carbon. 
D) I = Oxygen; II = π electrons in bond; III = nitrogen. 
A) I = Hydrogen; II = π electrons in bond; III = nitrogen. 
B) I = Oxygen; II = carbon; III = nitrogen. 
C) I = Hydrogen; II = carbon; III = carbon. 
D) I = Oxygen; II = π electrons in bond; III = nitrogen.

Question 9

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 10

Which of the following compounds is the strongest acid?

Accepted Answer

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

Question 11

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

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 12

Which of the following compounds has the lowest pKa?

Accepted Answer

A) H2O 
B) H2S 
C) NH3 
D) CH4 
A) H2O 
B) H2S 
C) NH3 
D) CH4

Exam 2: Acids and Bases

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

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

Which of the following statements explains why H2O is a stronger acid than CH4?

Which is the conjugate acid in the following reaction?

What is the electrophilic site in the following compounds?

Which is the conjugate acid in the following reaction?

Which of the following compounds is the weakest acid?

What is the nucleophilic site in the following compounds?

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

Which of the following compounds is the strongest acid?

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

Which of the following compounds has 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

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 statements explains why H₂O is a stronger acid than CH₄?

Which of the following compounds has the lowest pK_a?