Question 1

Which statement is not true?

Accepted Answer

A) A molecule that is not superimposable on its mirror image is a chiral molecule. 
B) Enantiomers are mirror images that are not superimposable. 
C) A carbon atom surrounded by four different groups is a chirality center. 
D) A racemic mixture contains an equal mixture of two diastereomers. 
A) A molecule that is not superimposable on its mirror image is a chiral molecule. 
B) Enantiomers are mirror images that are not superimposable. 
C) A carbon atom surrounded by four different groups is a chirality center. 
D) A racemic mixture contains an equal mixture of two diastereomers.

Question 2

The Fischer projection shown on the right properly represents the three-dimensional compound shown on the left.

Accepted Answer

A) True 
 B)False

Question 3

_____ are stereoisomers that are not mirror images of each other.

Accepted Answer

The answer of _____ are stereoisomers that are not mirror...

Question 4

Any molecule with two chirality centers is an achiral compound.

Accepted Answer

A) True 
 B)False

Question 5

How many chirality centers are present in the compound below?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 5 
A) 0 
B) 1 
C) 2 
D) 3 
E) 5

Question 6

The compounds shown below are related as constitutional isomers.

Accepted Answer

A) True 
 B)False

Question 7

Hexane (CH3CH2CH2CH2CH2CH3)has a mirror image, but it does not have an enantiomer.

Accepted Answer

A) True 
 B)False

Question 8

Alanine, shown below, is a naturally occurring chiral amino acid. Which pair represents the two enantiomers of alanine?

Accepted Answer

A)    and   
B)    and   
C)    and   
A)    and   
B)    and   
C)    and

Question 9

Which molecule is chiral?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 10

The shape of a chirality center is _____.

Accepted Answer

The answer of The shape of a chirality center is...

Question 11

How many chirality centers does the following molecule contain?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
A) 0 
B) 1 
C) 2 
D) 3

Question 12

For an odor to be perceived, a molecule must bind to an olfactory receptor, resulting in a nerve impulse that travels to the brain.

Accepted Answer

A) True 
 B)False

Question 13

How are the Fischer projections below related?

Accepted Answer

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

Question 14

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 15

Which compound has the most stereoisomers?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 16

The drug L-Dopa

Accepted Answer

A) is marketed as a racemic mixture for the treatment of Parkinson's disease. 
B) was first isolated from the leaves of the broad bean Vicia faba. 
C) is a chiral molecule with two chirality centers. 
D) has only one enantiomer that is active against Parkinson's disease. 
A) is marketed as a racemic mixture for the treatment of Parkinson's disease. 
B) was first isolated from the leaves of the broad bean Vicia faba. 
C) is a chiral molecule with two chirality centers. 
D) has only one enantiomer that is active against Parkinson's disease.

Question 17

The compound 3, 6-diethyl-6-methyl-3-decanethiol is a chiral molecule with more than one chirality center.

Accepted Answer

A) True 
 B)False

Question 18

Which molecule is chiral?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 19

What property is the odor of a molecule most dependent on?

Accepted Answer

A) the functional groups present in the molecule 
B) the shape of the molecule 
C) whether a molecule can form hydrogen bonds 
D) the number of carbons in the molecule 
A) the functional groups present in the molecule 
B) the shape of the molecule 
C) whether a molecule can form hydrogen bonds 
D) the number of carbons in the molecule

Question 20

Carbohydrates, lipids, proteins, and nucleic acids are all chiral biomolecules. What does the term chiral indicate about a molecule?

Accepted Answer

A) The molecule can be synthesized by the body. 
B) The molecule can be digested by the body. 
C) The molecule has a mirror image. 
D) The molecule and its mirror image are not identical. 
A) The molecule can be synthesized by the body. 
B) The molecule can be digested by the body. 
C) The molecule has a mirror image. 
D) The molecule and its mirror image are not identical.

Exam 15: The Three-Dimensional Shape of Molecules

Which statement is not true?

The Fischer projection shown on the right properly represents the three-dimensional compound shown on the left.

_____ are stereoisomers that are not mirror images of each other.

Any molecule with two chirality centers is an achiral compound.

How many chirality centers are present in the compound below?

The compounds shown below are related as constitutional isomers.

Hexane (CH3CH2CH2CH2CH2CH3)has a mirror image, but it does not have an enantiomer.

Alanine, shown below, is a naturally occurring chiral amino acid. Which pair represents the two enantiomers of alanine?

Which molecule is chiral?

The shape of a chirality center is _____.

How many chirality centers does the following molecule contain?

For an odor to be perceived, a molecule must bind to an olfactory receptor, resulting in a nerve impulse that travels to the brain.

How are the Fischer projections below related?

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

Which compound has the most stereoisomers?

The drug L-Dopa

The compound 3, 6-diethyl-6-methyl-3-decanethiol is a chiral molecule with more than one chirality center.

Which molecule is chiral?

What property is the odor of a molecule most dependent on?

Carbohydrates, lipids, proteins, and nucleic acids are all chiral biomolecules. What does the term chiral indicate about a molecule?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

Solutions

Acids and Bases

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

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

Hexane (CH₃CH₂CH₂CH₂CH₂CH₃)has a mirror image, but it does not have an enantiomer.