Question 1

What is the role of methylchloride (CH3Cl)in the following reaction?

Accepted Answer

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

Question 2

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 3

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 4

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 5

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 6

Which of the following compounds is both a Brønsted-Lowry acid and base?

Accepted Answer

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

Question 7

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 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 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 10

Which of the following compounds is the strongest acid?

Accepted Answer

A) CH3OH 
B) BrCH2OH 
C) CH3NH2 
D) CH3Cl 
A) CH3OH 
B) BrCH2OH 
C) CH3NH2 
D) CH3Cl

Question 11

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 12

What is the correct rank of the following compounds in order of increasing acidity?

Accepted Answer

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

Question 13

What is the conjugate base of HSO4-? SO42- H2SO4 SO3 H2O
I II III IV

Accepted Answer

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

Question 14

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

Question 15

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 16

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 17

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 18

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-

Question 19

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 20

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

Exam 2: Acids and Bases

What is the role of methylchloride (CH3Cl)in the following reaction?

Which of the following compounds is the weakest acid?

Which of the following compounds is not a Lewis acid?

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

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

Which of the following compounds is both a Brønsted-Lowry acid and base?

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

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

Which of the following statements about acid strength is true?

Which of the following compounds is the strongest acid?

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

What is the correct rank of the following compounds in order of increasing acidity?

What is the conjugate base of HSO4-? SO42- H2SO4 SO3 H2O I II III IV

Which of the following compounds has the lowest pKa?

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

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

Which of the following compounds is the weakest acid?

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

What is the nucleophilic site in the following compounds?

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

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

Molecular Ion Peaks and Fragmentation Patterns

Analyzing Molecular Motion and Infrared Spectroscopy

Organic Spectroscopy Concepts

Filters

What is the role of methylchloride (CH₃Cl)in the following reaction?

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

What is the conjugate base of HSO₄^-? SO₄^2- H₂SO₄ SO₃ H₂O I II III IV

Which of the following compounds has the lowest pK_a?

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

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