Deck 3: Acids and Bases

Question 1

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

A) CH₃OH
B) CH₃CH₃
C) CH₃OCH₃
D) CH₃SH
E) None of these

Answer 1

CH₃CH₃

Question 2

A gain of proton by a Brønsted-Lowry base results in a ___.

A) Lewis acid
B) conjugate acid
C) conjugate base
D) conjugate acid-base pair
E) None of these

Answer 2

conjugate acid

Question 3

What is the conjugate base of phosphoric acid?

A) HPO₄^2-
B) H₂PO₄^-
C) HPO₃^2-
D) PO₄^3-
E) None of these

Answer 3

H₂PO₄^-

Question 4

What is the conjugate base of CH₃CH₂SH?

A) CH₃CH₂S^-
B) CH₃CH₂^-
C) CH₃CH₂SH₂⁺
D) CH₃CH₂S^2-
E) None of these

Question 5

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

A) CH₃OH
B) CH₃OCH₃
C) CH₃NH₂
D) CH₃CH₃
E) None of these

Question 6

A loss of proton from a Brønsted-Lowry acid results in a ___.

A) Lewis acid
B) conjugate acid
C) conjugate base
D) conjugate acid-base pair
E) None of these

Question 7

In a Brønsted-Lowry acid-base reaction, the products are _______.

A) Brønsted-Lowry acid and Brønsted-Lowry base
B) Brønsted-Lowry acid and conjugate base
C) Brønsted-Lowry base and conjugate acid
D) conjugate acid and conjugate base
E) Brønsted-Lowry acid and conjugate acid

Question 8

For the following reaction, which reactant functions as a base?

A) I
B) II
C) III
D) IV
E) none of the above

Question 9

Identify a Brønsted-Lowry base.

A) proton acceptor
B) proton donor
C) species remaining after acid is deprotonated
D) species remaining after base is protonated

Question 10

Identify a Brønsted-Lowry acid.

A) proton acceptor
B) proton donor
C) species remaining after acid is deprotonated
D) species remaining after base is protonated

Question 11

For the following reaction, which reactant functions as a base?

A) I
B) II
C) III
D) IV
E) none of the above

Question 12

Identify a conjugate base.

A) proton acceptor
B) proton donor
C) species remaining after acid is deprotonated
D) species remaining after base is protonated

Question 13

Identify a conjugate acid.

A) proton acceptor
B) proton donor
C) species remaining after acid is deprotonated
D) species remaining after base is protonated

Question 14

For the following reaction, which reactant functions as an acid?

A) I
B) II
C) III
D) IV
E) none of the above

Question 15

Draw the conjugate acid of CH₃CH₂OH.

Question 16

For the following reaction, which reactant functions as a base?

A) I
B) II
C) III
D) IV
E) none of the above

Question 17

In a Brønsted-Lowry acid-base reaction, the reactants are _______.

A) Brønsted-Lowry acid and Brønsted-Lowry base
B) Brønsted-Lowry acid and conjugate base
C) Brønsted-Lowry base and conjugate acid
D) conjugate acid and conjugate base
E) Brønsted-Lowry acid and conjugate acid

Question 18

For the following reaction, which reactant functions as an acid?

A) I
B) II
C) III
D) IV
E) none of the above

Question 19

What is the conjugate base of nitric acid?

A) NO₃^-
B) NO₂^-
C) HNO₃
D) HNO₂
E) None of these

Question 20

Draw the conjugate acid of CH₃OCH₃

Question 21

Draw the conjugate base of CH₃C $\equiv$ CH.

Question 22

Identify the acid and the base and provide a curved arrow mechanism for the following reaction.

Question 23

Identify the conjugate acid in the following reaction.

A) I
B) II
C) III
D) IV
E) none of the above

Question 24

Draw the conjugate base of CH₃CH₂NH₂.

Question 25

Identify the acid and the base and provide a curved arrow mechanism for the following reaction.

Question 26

Draw the conjugate base of the following compound.

Question 27

For the following reaction label the acid, base, conjugate acid and conjugate base.

Question 28

For the following reaction label the acid, base, conjugate acid and conjugate base.

Question 29

Provide a curved arrow mechanism for the following acid-base reaction.

Question 30

Draw the conjugate base of the following compound.

Question 31

The tail of the curved arrow must start at ____ electron density and the head must end at ____ electron density.

A) low, high
B) high, high
C) low, low
D) high, low

Question 32

Draw the conjugate acid of the following compound.

Question 33

For the following reaction label the acid, base, conjugate acid and conjugate base.

Question 34

The following reaction mechanism contains mistakes. Which of the following statements correctly describes the curved arrows consistent with the reaction?

A) The curved arrow should start at the carbonyl oxygen atom
B) The curved arrow should start at the hydride, go to the hydrogen connected to oxygen and a second arrow should start from the O-H covalent bond and go to the oxygen
C) The curved arrow should start at the oxygen atom of the OH
D) There should be two more arrows

Question 35

Identify the Brønsted-Lowry acid in the following reaction.

A) I
B) II
C) III
D) IV
E) none of the above

Question 36

Identify the conjugate base in the following reaction.

A) I
B) II
C) III
D) IV
E) none of the above

Question 37

Identify the Brønsted-Lowry base in the following reaction.

A) I
B) II
C) III
D) IV
E) none of the above

Question 38

Provide a curved arrow mechanism for the following acid-base reaction.

Question 39

Provide a curved arrow mechanism for the following acid-base reaction.

Question 40

Identify the acid and the base and provide a curved arrow mechanism for the following reaction.

Question 41

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 42

What is the K_eq for the following reaction?

A) I
B) II
C) III
D) IV
E) Both II & III

Question 43

Which of the following compounds is most acidic?

A) CH₃OH
B) HCl
C) CH₃SH
D) CH₃NH₂

Question 44

Tryptophan, an essential amino acid, is important in the synthesis of the neurotransmitter serotonin in the body. It has the following structure. Circle the three most acidic protons in tryptophan.

Question 45

Which of the following compounds is most basic?

A) I
B) II
C) III
D) IV
E) All of these

Question 46

Which of the following compounds is more acidic? Explain why.
CH₃OH and CH₃NH₂

Question 47

Which of the following compounds is most acidic?

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

Question 48

Histidine an amino acid has the following structure. Circle the three most acidic protons in histidine.

Question 49

Which of the following compounds is most acidic?

A) I
B) II
C) III
D) IV
E) All of these

Question 50

Which of the following compounds is most basic?

A) I
B) II
C) III
D) IV
E) None of these

Question 51

For the following reaction mechanism, identify the error, if any and describe the modification necessary by drawing the correct mechanism.

Question 52

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 53

Predict the products for the following acid-base reaction.

Question 54

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 55

Which of the following compounds is most acidic?

A) I
B) II
C) III
D) IV
E) None of these

Question 56

For the following reaction mechanism, identify the error, if any and describe the modification necessary by drawing the correct mechanism.

Question 57

Predict the products for the following acid-base reaction.

Question 58

Which of the following compounds is most basic?

A) I
B) II
C) III
D) IV
E) All of these

Question 59

Which of the following compounds is more acidic? Explain why.
HF and HBr

Question 60

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 61

Which of the indicated protons is most acidic?

A) I
B) II
C) III
D) IV
E) All of these

Question 62

Which of the indicated protons is most acidic?

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

Question 63

Explain why phenol is more acidic than ethanol.

Question 64

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 65

Which of the indicated protons is most acidic?

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

Question 66

Which of the following compounds is more acidic? Explain why.

Question 67

Rank the indicated protons in decreasing order of acidity.

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

Question 68

Which of the following compounds is most acidic?

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

Question 69

Which compound has the most acidic proton?

A) I
B) II
C) III

Question 70

Which of the following compounds is most acidic?

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

Question 71

Which of the following compounds is most acidic?

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

Question 72

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 73

Which of the indicated protons is most acidic? Explain why.

Question 74

For the following acid-base reaction, predict which side of the equilibrium is favored.

A) favor right side
B) favor left side
C) neither

Question 75

Rank the following compounds in decreasing order of acidity.

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

Question 76

Determine which proton is most acidic in the following compound. Explain why.

Question 77

Which of the following compounds is most acidic?

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

Question 78

Which of the following compounds is most acidic?

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

Question 79

Rank the following protons in decreasing order of acidity.

A) II > III > I
B) I > II > III
C) III > I > II
D) III > II > I
E) None of these

Question 80

Aspartic acid, an amino acid, has the following structure. Circle the most acidic proton in aspartic acid. Explain your choice.