Question 1

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 D

Question 2

Which of the following statements explain 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-. D

Question 3

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- B

Question 4

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

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 5

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 6

Rank the following compounds in order of increasing acidity, putting the least acidic first. $$\begin{array} { c c c c } 
\mathrm { CH } _ { 3 } \mathrm { COOH } & \mathrm { FCH } _ { 2 } \mathrm { COOH } & \mathrm { ClCH } _ { 2 } \mathrm { COOH } & \mathrm { BrCH } _ { 2 } \mathrm { COOH } \
\text { I } & \text { II } & \text { III } & \text { IV }
\end{array}$$

Accepted Answer

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

Question 7

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 8

Which of the following species is not a Brønsted-Lowry base?

Accepted Answer

A)  BF3 
B)  NH3 
C)  H2O 
D)  PO43- 
A)  BF3 
B)  NH3 
C)  H2O 
D)  PO43-

Question 9

Which of the following species cannot act as both a Brønsted-Lowry acid and base?

Accepted Answer

A)  HCO3- 
B)  HSO4- 
C)  HO- 
D)  H2PO4- 
A)  HCO3- 
B)  HSO4- 
C)  HO- 
D)  H2PO4-

Question 10

Which is the conjugate base in the following reaction? $$\begin{array} { l } 
\mathrm { HCl }  &+& \mathrm { H } _ { 2 } \mathrm { O } ?&\mathrm { Cl } ^ { \ominus } &+& \mathrm { H } _ { 3 } \mathrm { O }^ { \oplus }  \
\text { I }&&\text { II } &\text { III } &&\text { IV } \
\end{array}$$

Accepted Answer

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

Question 11

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 12

Rank the following conjugate bases in order of increasing basicity, putting the least basic first. $$\begin{array} {llll}
 \Theta _ { \mathrm { NH } _ { 2 } }&\mathrm { HO } ^ { \ominus }&\Theta _ { \mathrm { CH } _ { 3 } }\ \text { I }&\text { II } &\text { III } \ \end{array}$$

Accepted Answer

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

Question 13

Which of the following compounds is the strongest acid? $$\begin{array} { l } 
\mathrm { CH } _ { 4 }&\mathrm { CH } _ { 3 } \mathrm { CH } _ { 3 }&\mathrm { H } _ { 2 } \mathrm { C } = \mathrm { CH } _ { 2 }&\mathrm { HC } \equiv \mathrm { CH }\\text { I }&\text { II } &\text { III } &\text { IV } \
\end{array}$$

Accepted Answer

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

Question 14

Which of the following concepts can be used to explain the difference in acidity between acetic acid (CH3COOH) and ethanol (CH3CH2OH)?

Accepted Answer

A)  Hybridization 
B)  Electronegativity 
C)  Resonance 
D)  Size 
A)  Hybridization 
B)  Electronegativity 
C)  Resonance 
D)  Size

Question 15

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 16

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 17

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 18

Rank the following conjugate bases in order of decreasing basicity, putting the most basic first. $$\begin{array} {llll}\mathrm { H } _ { 2 } \mathrm { C } = ^\Theta  { \mathrm { CH } }&\mathrm { HC} \equiv \mathrm {^\Theta  C }&^\Theta _ { \mathrm { CH } _ { 3 } }\
\text { I }&\text { II } &\text { III } \ \end{array}$$

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 19

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 20

Which is the conjugate acid in the following reaction? $$\begin{array} { l } 
\mathrm { HCl }  &+& \mathrm { H } _ { 2 } \mathrm { O } ?&\mathrm { Cl } ^ { \ominus } &+& \mathrm { H } _ { 3 } \mathrm { O }^ { \oplus }  \
\text { I }&&\text { II } &\text { III } &&\text { IV } \
\end{array}$$

Accepted Answer

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

Exam 2: Acids and Bases

Which of the following compounds is the weakest acid?

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

Which of the following species is the strongest base?

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

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

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

Which of the following compounds has the lowest pKa?

Which of the following species is not a Brønsted-Lowry base?

Which of the following species cannot act as both a Brønsted-Lowry acid and base?

Which is the conjugate base in the following reaction? + ? + I II III IV

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

Rank the following conjugate bases in order of increasing basicity, putting the least basic first. I II III

Which of the following compounds is the strongest acid? = \equiv I II III IV

Which of the following concepts can be used to explain the difference in acidity between acetic acid (CH3COOH) and ethanol (CH3CH2OH)?

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

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

Which of the following statements about acid strength is true?

Rank the following conjugate bases in order of decreasing basicity, putting the most basic first. \equiv I II III

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

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

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

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

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

Which of the following compounds has the lowest pK_a?

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

Which of the following concepts can be used to explain the difference in acidity between acetic acid (CH₃COOH) and ethanol (CH₃CH₂OH)?

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