Deck 3: Acids and Bases

Question 1

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

A) I
B) II
C) neither

Answer 1

II

Question 2

What is the conjugate base of CH₃CH₂SH?

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

Answer 2

CH₃CH₂S^-

Question 3

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

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

Answer 3

CH₃CH₃

Question 4

What is the conjugate base of nitric acid?

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

Question 5

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

A) I
B) II
C) neither

Question 6

Draw the conjugate acid of the following compound.

Question 7

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

A) I
B) II
C) neither

Question 8

Draw the conjugate acid of CH₃CH₂OH.

Question 9

In a Brønsted-Lowry acid-base reaction the product(s) is (are) a _______.

Question 10

A Brønsted-Lowry acid is defined as a ____ and a Brønsted-Lowry base is defined as a ____.

A) proton acceptor, proton donor
B) proton donor, proton donor
C) proton acceptor, proton acceptor
D) proton donor, proton acceptor
E) None of these

Question 11

What is the conjugate base of phosphoric acid?

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

Question 12

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

A) I
B) II
C) neither

Question 13

Provide a definition of a Brønsted-Lowry base.

Question 14

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 15

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

Question 16

In a Bronsted-Lowry acid-base reaction the product(s) is (are) a _______.

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

Question 17

Provide a definition of a Brønsted-Lowry acid.

Question 18

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

A) CH₃OH
B) CH₃CH₃
C) CH₃NH₂
D) CH₃SH
E) None of these

Question 19

Draw the conjugate acid of CH₃OCH₃

Question 20

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

A) I
B) II
C) neither

Question 21

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

Question 22

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

Question 23

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

Question 24

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

Question 25

Provide a curved arrow mechanism for the following acid-base 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

Which is the conjugate base in the following reaction?

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

Question 29

Which is the conjugate acid in the following reaction?

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

Question 30

Draw the conjugate base of CH₃CH₂NH₂.

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

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

Question 33

Which is the conjugate base in the following reaction?

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

Question 34

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

Question 35

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

Question 36

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

Question 37

Which is the conjugate acid in the following reaction?

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

Question 38

Draw the conjugate base of the following compound.

Question 39

The following reaction mechanism contains error. 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 one more arrow

Question 40

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

Question 41

Which of the following compounds is most basic?

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

Question 42

Predict the products for the following acid-base reaction.

Question 43

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

Question 44

Which of the following compounds is most acidic?

A) CH₃OH
B) HCl
C) CH₃SH
D) CH₃NH₂

Question 45

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

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

Question 46

Which of the following compounds is most basic?

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

Question 47

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

Question 48

What is the K_eq for the following reaction?

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

Question 49

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 50

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

Question 51

Predict the products for the following acid-base reaction.

Question 52

Which of the following compounds is most basic?

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

Question 53

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

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

Question 54

Which of the following compounds is most acidic?

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

Question 55

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

Question 56

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

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

Question 57

Which of the following compounds is most acidic?

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

Question 58

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

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

Question 59

Which of the following compounds is most acidic?

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

Question 60

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

Question 61

Which of the following compounds is most acidic?

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

Question 62

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

Question 63

Which of the following compounds is most acidic?

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

Question 64

Which of the indicated protons is most acidic?

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

Question 65

Which of the following compounds is most acidic?

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

Question 66

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

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

Question 67

Which of the following compounds is most acidic?

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

Question 68

Rank the following protons in decreasing order (most to least) of acidity.

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

Question 69

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

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

Question 70

Which of the indicated protons is most acidic? Explain your choice.

Question 71

Rank the indicated protons in decreasing order (most to least) of acidity.

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

Question 72

Which of the indicated protons is most acidic?

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

Question 73

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

Question 74

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

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

Question 75

Rank the following compounds in decreasing order (most to least) 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

Which compound has the most acidic proton? Explain your choice.

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 more acidic? Explain why.

Question 79

Explain why phenol is more acidic than ethanol.

Question 80

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

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