Question 1

Diastereomers are stereoisomers that are

Accepted Answer

A) mirror images of each other. 
B) not mirror images of each other. 
C) nonsuperimposable mirror images of each other. 
D) superimposable on each other. 
A) mirror images of each other. 
B) not mirror images of each other. 
C) nonsuperimposable mirror images of each other. 
D) superimposable on each other.

Question 2

Ethambutol (structure shown)is a bacteriostatic antimycobacterial drug prescribed to treat tuberculosis (Mycobacterium tuberculosis). There are _____ chirality centers in ethambutol.

Accepted Answer

The answer of Ethambutol (structure shown)is a bacteriostatic antimycobacterial drug...

Question 3

Consider the stereoisomers (A-E)drawn below:   Structures C and D are _____.

Accepted Answer

A) identical molecules 
B) enantiomers 
C) constitutional isomers 
D) diastereomers 
A) identical molecules 
B) enantiomers 
C) constitutional isomers 
D) diastereomers

Question 4

Consider the stereoisomers (A-E)drawn below:   Structures A and C are related as _____.

Accepted Answer

A) identical molecules 
B) enantiomers 
C) constitutional isomers 
D) diastereomers 
A) identical molecules 
B) enantiomers 
C) constitutional isomers 
D) diastereomers

Question 5

Recent rulings by the Food and Drug Administration have encouraged the development of so-called racemic switches, the patenting and marketing of a single enantiomer that was originally sold as a racemic mixture.

Accepted Answer

A) True 
 B)False

Question 6

Two enantiomers typically have the same biological activity.

Accepted Answer

A) True 
 B)False

Question 7

Which molecule is an enantiomer of the one shown below?

Accepted Answer

A)    
B)    
C)    
D) None of the molecules above is an enantiomer of the original molecule. 
A)    
B)    
C)    
D) None of the molecules above is an enantiomer of the original molecule.

Question 8

The alkyl bromide below contains one chirality center.

Accepted Answer

A) True 
 B)False

Question 9

The compounds shown below are related as constitutional isomers.

Accepted Answer

A) True 
 B)False

Question 10

Aspartame contains two chirality centers.

Accepted Answer

A) True 
 B)False

Question 11

Which, if any, of the labeled carbon atoms in the compound below is a chirality center?

Accepted Answer

A) C1 is a chirality center and C2 is not a chirality center. 
B) C1 is not a chirality center and C2 is a chirality center. 
C) C1 and C2 are both chirality centers. 
D) Neither C1 nor C2 are chirality centers. 
A) C1 is a chirality center and C2 is not a chirality center. 
B) C1 is not a chirality center and C2 is a chirality center. 
C) C1 and C2 are both chirality centers. 
D) Neither C1 nor C2 are chirality centers.

Question 12

Which object is chiral?

Accepted Answer

A) a sock 
B) a shoe 
C) a baseball 
D) a fork 
E) More than one of the objects above is chiral. 
A) a sock 
B) a shoe 
C) a baseball 
D) a fork 
E) More than one of the objects above is chiral.

Question 13

Penicillamine is used to treat arthritis. How many chirality centers are present in penicillamine?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) more than 3 
A) 0 
B) 1 
C) 2 
D) 3 
E) more than 3

Question 14

The Fischer projection formula for D-mannose, a hexose sugar, is shown below. How many chirality centers are in D-mannose?

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 6 
A) 2 
B) 4 
C) 5 
D) 6

Question 15

If a stereoisomer has an enantiomer, it does not have a diastereomer.

Accepted Answer

A) True 
 B)False

Question 16

Enantiomers are mirror images that are not superimposable.

Accepted Answer

A) True 
 B)False

Question 17

Ampicillin (structure shown)is an antibiotic that has been used extensively to treat bacterial infections since 1961. There are _____ chirality centers in ampicillin.

Accepted Answer

The answer of Ampicillin (structure shown)is an antibiotic that has...

Question 18

Which nonsteroidal anti-inflammatory drug(s)(NSAID)is/are sold as a racemic mixture?

Accepted Answer

A) Naproxen 
B) Ibuprofen 
C) Both Naproxen and Ibuprofen are sold as a racemic mixture. 
D) Neither Naproxen nor Ibuprofen are sold as a racemic mixture. 
A) Naproxen 
B) Ibuprofen 
C) Both Naproxen and Ibuprofen are sold as a racemic mixture. 
D) Neither Naproxen nor Ibuprofen are sold as a racemic mixture.

Question 19

The molecule below is achiral.

Accepted Answer

A) True 
 B)False

Question 20

What is always true about compounds related as isomers?

Accepted Answer

A) They differ in the way that atoms are connected to one another. 
B) They have different functional groups. 
C) They have the same molecular formula. 
D) They are mirror images of each other. 
E) All of the statements above are correct. 
A) They differ in the way that atoms are connected to one another. 
B) They have different functional groups. 
C) They have the same molecular formula. 
D) They are mirror images of each other. 
E) All of the statements above are correct.

Exam 15: The Three-Dimensional Shape of Molecules

Diastereomers are stereoisomers that are

Ethambutol (structure shown)is a bacteriostatic antimycobacterial drug prescribed to treat tuberculosis (Mycobacterium tuberculosis). There are _____ chirality centers in ethambutol.

Consider the stereoisomers (A-E)drawn below: Structures C and D are _____.

Consider the stereoisomers (A-E)drawn below: Structures A and C are related as _____.

Recent rulings by the Food and Drug Administration have encouraged the development of so-called racemic switches, the patenting and marketing of a single enantiomer that was originally sold as a racemic mixture.

Two enantiomers typically have the same biological activity.

Which molecule is an enantiomer of the one shown below?

The alkyl bromide below contains one chirality center.

The compounds shown below are related as constitutional isomers.

Aspartame contains two chirality centers.

Which, if any, of the labeled carbon atoms in the compound below is a chirality center?

Which object is chiral?

Penicillamine is used to treat arthritis. How many chirality centers are present in penicillamine?

The Fischer projection formula for D-mannose, a hexose sugar, is shown below. How many chirality centers are in D-mannose?

If a stereoisomer has an enantiomer, it does not have a diastereomer.

Enantiomers are mirror images that are not superimposable.

Ampicillin (structure shown)is an antibiotic that has been used extensively to treat bacterial infections since 1961. There are _____ chirality centers in ampicillin.

Which nonsteroidal anti-inflammatory drug(s)(NSAID)is/are sold as a racemic mixture?

The molecule below is achiral.

What is always true about compounds related as isomers?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

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Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

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Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

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