Question 1

An acid with a low pKa is a strong acid and has a weak conjugate base.

Accepted Answer

A) True 
 B)False  True

Question 2

Which of the following compounds is the strongest acid?

Accepted Answer

A)  CH3CH2CH2COOH 
B)  CH3CH2CHClCOOH 
C)  CH3CHClCH2COOH 
D)  ClCH2CH2CH2COOH 
A)  CH3CH2CH2COOH 
B)  CH3CH2CHClCOOH 
C)  CH3CHClCH2COOH 
D)  ClCH2CH2CH2COOH B

Question 3

Provide the equation for the acid dissociate constant, Ka,for the following equilibrium. $\mathrm{HA}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{A}^{-}+\mathrm{H}_{3} \mathrm{O}^{+}$

Accepted Answer

$K_{\mathrm{a}}=\left[\mathrm{H}_{2} \mathrm{O}\right] K_{\mathrm{eq}}=\frac{\left[\mathrm{A}^{-}\right]\left[\mathrm{H}_{3} \mathrm{O}^{+}\right]}{[\mathrm{HA}]}$

Question 4

Provide a brief explanation, based on features of the molecules, for the following trend in pKa values?
CH3OH > CH3NH2 > CH3CH3
 16 38 51

Accepted Answer

This trend is best understood in terms o

Question 5

Which set of curved arrows accounts for the deprotonation of an acid (A-H) by a base (:B)?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 6

Which of the following is present in the highest concentration upon dissolution of H2SO4 in water?

Accepted Answer

A)  H2SO4 
B)  H+ 
C)  H3O+ 
D)  HO− 
A)  H2SO4 
B)  H+ 
C)  H3O+ 
D)  HO−

Question 7

Which of the following is the strongest base?

Accepted Answer

A)  iodide anion, I− 
B)  fluoride anion, F− 
C)  bromide anion, Br− 
D)  chloride anion, Cl− 
A)  iodide anion, I− 
B)  fluoride anion, F− 
C)  bromide anion, Br− 
D)  chloride anion, Cl−

Question 8

Which of the following terms describes the reactivity of trimethylamine, (CH3)3N?

Accepted Answer

A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base 
A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base

Question 9

Under which of the following conditions will a reaction be spontaneous when ΔH° > 0?

Accepted Answer

A) TΔS° = 0 B) −TΔS° > ΔH° C) TΔS° < 0° D) ΔG° = 0 A) TΔS° = 0 B) −TΔS° > ΔH° C) TΔS° < 0° D) ΔG° = 0

Question 10

Indole is pleasant smelling in highly dilute solutions and has been used in perfumery.   Indole can be classified as a Brønsted-Lowry base but not as a Lewis base..

Accepted Answer

A) True 
 B)False

Question 11

Which of the following compounds has the lowest pKa?

Accepted Answer

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

Question 12

Which of the following compounds is the strongest acid?

Accepted Answer

A)  CH3OCH3 
B)  CH3CH2OH 
C)  CH3CHO 
D)  CH3CO2H 
A)  CH3OCH3 
B)  CH3CH2OH 
C)  CH3CHO 
D)  CH3CO2H

Question 13

Which of the following terms describes the role of ethene in the acid-base reaction shown?

Accepted Answer

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

Question 14

In the following list, there are two organic Lewis bases.
​   ​

Accepted Answer

A) True 
 B)False

Question 15

Which of the following terms describes the reactivity of boron tribromide, BBr3?

Accepted Answer

A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base 
A)  Brønsted-Lowry acid and Lewis acid 
B)  Brønsted-Lowry base and Lewis base 
C)  Lewis acid and not a Brønsted-Lowry acid 
D)  Lewis base and not a Brønsted-Lowry base

Question 16

What is the value of the equilibrium constant, Keq, for the following reaction?

Accepted Answer

A)  109 
B)  10−9 
C)  9 
D) . 1/9 
A)  109 
B)  10−9 
C)  9 
D) . 1/9

Question 17

What is the value of the equilibrium constant for the following equilibrium? $\mathrm{HC} \equiv \mathrm{CH}+\mathrm{NaOH}\rightleftharpoons$$\mathrm{HC} \equiv \mathrm{C:}^{-} \mathrm{Na}^{+}+\mathrm{H}_{2} \mathrm{O}$
$p K_{a}=25$ $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ $p K_{a}=15.7$

Accepted Answer

log₁₀K_eq = pK_a(acid) - pK

Question 18

Provide a brief explanation, based on features of the molecules, for the following trend in pKa values?
​
CH3CH3 > CH2=CH2 > HCCH
ethane ethene ethyne
(ethylene) (acetylene)
51 44 25

Accepted Answer

This trend is best understood in terms o

Question 19

What is the value of the equilibrium constant for the following equilibrium? $\mathrm{HC} \equiv \mathrm{CH}+\mathrm{NaNH}_{2}\rightleftharpoons$$\mathrm{HC} \equiv \mathrm{C}_{:}^{-} \mathrm{Na}^{+}+\mathrm{NH}_{3}$
$p K_{\mathrm{a}}=25$ $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$p K_{a}=38$

Accepted Answer

log₁₀K_eq = pK_a(acid) - pK

Question 20

Which of the following compounds is the strongest acid?

Accepted Answer

A)  CF3OH 
B)  CF3CH2 CH2OH 
C)  CF3CH2 CH2 CH2OH 
D)  CF3CH2 CH2 CH2CH2OH 
A)  CF3OH 
B)  CF3CH2 CH2OH 
C)  CF3CH2 CH2 CH2OH 
D)  CF3CH2 CH2 CH2CH2OH

Exam 4: Acids and Bases

An acid with a low pKa is a strong acid and has a weak conjugate base.

Which of the following compounds is the strongest acid?

Provide the equation for the acid dissociate constant, Ka,for the following equilibrium. HA+H2O⇌A−+H3O+\mathrm{HA}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{A}^{-}+\mathrm{H}_{3} \mathrm{O}^{+}HA+H2​O⇌A−+H3​O+

Provide a brief explanation, based on features of the molecules, for the following trend in pKa values? CH3OH > CH3NH2 > CH3CH3 16 38 51

Which set of curved arrows accounts for the deprotonation of an acid (A-H) by a base (:B)?

Which of the following is present in the highest concentration upon dissolution of H2SO4 in water?

Which of the following is the strongest base?

Which of the following terms describes the reactivity of trimethylamine, (CH3)3N?

Under which of the following conditions will a reaction be spontaneous when ΔH° > 0?

Indole is pleasant smelling in highly dilute solutions and has been used in perfumery. Indole can be classified as a Brønsted-Lowry base but not as a Lewis base..

Which of the following compounds has the lowest pKa?

Which of the following compounds is the strongest acid?

Which of the following terms describes the role of ethene in the acid-base reaction shown?

In the following list, there are two organic Lewis bases. ​ ​

Which of the following terms describes the reactivity of boron tribromide, BBr3?

What is the value of the equilibrium constant, Keq, for the following reaction?

Provide a brief explanation, based on features of the molecules, for the following trend in pKa values? ​ CH3CH3 > CH2=CH2 > HCCH ethane ethene ethyne (ethylene) (acetylene) 51 44 25

Which of the following compounds is the strongest acid?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

An acid with a low pK_a is a strong acid and has a weak conjugate base.

Provide the equation for the acid dissociate constant, K_a,for the following equilibrium. $\mathrm{HA}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{A}^{-}+\mathrm{H}_{3} \mathrm{O}^{+}$

Provide a brief explanation, based on features of the molecules, for the following trend in pK_a values? CH₃OH > CH₃NH₂ > CH₃CH₃ 16 38 51

Which of the following is present in the highest concentration upon dissolution of H₂SO₄ in water?

Which of the following terms describes the reactivity of trimethylamine, (CH₃)₃N?

Which of the following compounds has the lowest pK_a?

In the following list, there are two organic Lewis bases.

Which of the following terms describes the reactivity of boron tribromide, BBr₃?

What is the value of the equilibrium constant, K_eq, for the following reaction?

Provide a brief explanation, based on features of the molecules, for the following trend in pK_a values? CH₃CH₃ > CH₂=CH₂ > HCCH ethane ethene ethyne (ethylene) (acetylene) 51 44 25