Question 1

Which of the following statements about Lewis bases is true?

Accepted Answer

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

Question 2

Which of the following compounds is both a Brønsted-Lowry acid and base? $\mathrm { CH } _ { 3 } \mathrm { OH }$      $\mathrm { CH } _ { 3 } \mathrm { COCH } _ { 3 }$      $\mathrm { H } _ { 2 } \mathrm { O }$      $\left( \mathrm { CH } _ { 3 } \right) _ { 3 }\mathrm {~N}$
      I                              II              III            IV

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 3

What is the direction of equilibrium when acetylene (C2H2) reacts with ethoxide (CH3CH2O-) in an acid-base reaction?

Accepted Answer

A)  Left 
B)  Right 
C)  Neither 
D)  Cannot be determined 
A)  Left 
B)  Right 
C)  Neither 
D)  Cannot be determined

Question 4

Which is the conjugate acid in the following reaction? $$\begin{array} { l } 
\Theta _ { : \mathrm { CH } _ { 3 } } &+&{  \mathrm { H } _ { 2 } O} &?&{\mathrm { CH } _ { 4 } }&\mathrm { HO } ^ { \ominus } \
\text { I } &&\text { II } &&\text { IIII } &\text { IV } \
\end{array}$$

Accepted Answer

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

Question 5

Which of the following concepts can be used to explain the difference in acidity between ethanol (CH3CH2OH) and 2-fluoroethanol (FCH2CH2OH)?

Accepted Answer

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

Question 6

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 7

Rank the following compounds in order of decreasing acidity, putting the most acidic first. $$\begin{array} { c c c c } 
\mathrm { CH } _ { 3 } \mathrm { OCH } _ { 3 } & \mathrm { CH } _ { 3 } \mathrm { CHO } & \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH } & \mathrm { CH } _ { 3 } \mathrm { COOH } \
\text { I } & \text { II } & \text { III } & \text { IV }
\end{array}$$

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 8

Rank the following compounds in order of decreasing acidity, putting the most acidic first. $$\begin{array} {llll}\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { OH }
&\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 }
&\mathrm { ClCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { OH }\
\text { I }&\text { II } &\text { III } \ \end{array}$$

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 9

Rank the following compounds in order of decreasing acidity, putting the most acidic first. $$\begin{array} { c c c c } 
\mathrm { CH } _ { 4 } & \mathrm { NH } _ { 3 } & \text { HF } & \mathrm { H } _ { 2 } \mathrm { O } \
\text { I } & \text { II } & \text { III } & \text { IV }
\end{array}$$

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 10

Consider the following molecule with protons labeled, I-III. Rank these protons in order of decreasing acidity, putting the most acidic first.

Accepted Answer

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

Question 11

What is the nucleophilic site in the following compounds?

Accepted Answer

A)  I = Hydrogen; II = F1F1F1S1F1F1F10 electrons in bond; III = nitrogen. 
B)  I = Oxygen; II = carbon; III = nitrogen. 
C)  I = Hydrogen; II = carbon; III = carbon. 
D)  I = Oxygen; II = F1F1F1S1F1F1F10 electrons in bond; III = nitrogen. 
A)  I = Hydrogen; II = F1F1F1S1F1F1F10 electrons in bond; III = nitrogen. 
B)  I = Oxygen; II = carbon; III = nitrogen. 
C)  I = Hydrogen; II = carbon; III = carbon. 
D)  I = Oxygen; II = F1F1F1S1F1F1F10 electrons in bond; III = nitrogen.

Question 12

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 13

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 14

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 F1F1F1S1F1F1F10 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 F1F1F1S1F1F1F10 bond. 
C)  All Brønsted-Lowry bases contain a proton. 
D)  The net charge may be zero or positive.

Question 15

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 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

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 18

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 19

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 20

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

Exam 2: Acids and Bases

Which of the following statements about Lewis bases is true?

What is the direction of equilibrium when acetylene (C2H2) reacts with ethoxide (CH3CH2O-) in an acid-base reaction?

Which is the conjugate acid in the following reaction? + O ? I II IIII IV

Which of the following concepts can be used to explain the difference in acidity between ethanol (CH3CH2OH) and 2-fluoroethanol (FCH2CH2OH)?

Which of the following compounds is the weakest acid?

Rank the following compounds in order of decreasing acidity, putting the most acidic first. I II III IV

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

Rank the following compounds in order of decreasing acidity, putting the most acidic first. HF I II III IV

Consider the following molecule with protons labeled, I-III. Rank these protons in order of decreasing acidity, putting the most acidic first.

What is the nucleophilic site in the following compounds?

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

Identify the Lewis acid in the following reaction.

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

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

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

Identify the Lewis base in the following reaction.

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

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

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

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 Epoxides

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Electrophilic Aromatic Substitution

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

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

Lipids

Synthetic Polymers

Filters

What is the direction of equilibrium when acetylene (C₂H₂) reacts with ethoxide (CH₃CH₂O^-) in an acid-base reaction?

Which of the following concepts can be used to explain the difference in acidity between ethanol (CH₃CH₂OH) and 2-fluoroethanol (FCH₂CH₂OH)?

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

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

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