Question 1

A compound with three chirality centers has a maximum of ________ possible stereoisomers.

Accepted Answer

The answer of A compound with three chirality centers has...

Question 2

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 3

How many diastereomers can a chiral stereoisomer have?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) The number of diastereomers depends on the number of chirality centers. 
A) 1 
B) 2 
C) 3 
D) The number of diastereomers depends on the number of chirality centers.

Question 4

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 5

The major product of the dehydration of the alcohol below has one chirality center.

Accepted Answer

A) True 
 B)False

Question 6

How many chirality centers are present in the following molecule?

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 7

The cis and trans isomers of an alkene represent one example of stereoisomers.

Accepted Answer

A) True 
 B)False

Question 8

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 9

If one enantiomer causes plane-polarized light to rotate clockwise,that enantiomer is called dextrorotatory.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The Fischer projection shown to the right represents the enantiomer of the three-dimensional structure to the left.

Accepted Answer

A) True 
 B)False

Question 12

Enantiomers are mirror images that are not superimposable.

Accepted Answer

A) True 
 B)False

Question 13

Benazepril (structure shown)is a medication that has been used to treat high blood pressure. There are ________ chirality centers in benzaepril.

Accepted Answer

The answer of Benazepril (structure shown)is a medication that has...

Question 14

Which property of enantiomers is not identical?

Accepted Answer

A) Melting point 
B) Boiling point 
C) Solubility 
D) Specific rotation 
E) All of these properties are identical for a pair of enantiomers. 
A) Melting point 
B) Boiling point 
C) Solubility 
D) Specific rotation 
E) All of these properties are identical for a pair of enantiomers.

Question 15

The drug Thalidomide was ________.

Accepted Answer

A) invented by Frances Oldham Kelsey 
B) sold as a mixture of its two enantiomers,and each of these stereoisomers has a different biological activity 
C) was approved for use in the United States 
D) All of the choices are correct. 
A) invented by Frances Oldham Kelsey 
B) sold as a mixture of its two enantiomers,and each of these stereoisomers has a different biological activity 
C) was approved for use in the United States 
D) All of the choices are correct.

Question 16

Which molecule is an enantiomer of the one shown below?

Accepted Answer

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

Question 17

Propranol,shown below,is a chiral compound that exists as a pair of enantiomers. One enantiomer is used to treat irregular heartbeats,and the other enantiomer is used as a contraceptive. Identify the chirality center(s)in Propranol.

Accepted Answer

A) C1 
B) C2 
C) C3 
D) C4 
E) C1 and C3 
A) C1 
B) C2 
C) C3 
D) C4 
E) C1 and C3

Question 18

Which molecule is chiral?

Accepted Answer

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

Question 19

All tertiary alcohols (3°)are chiral.

Accepted Answer

A) True 
 B)False

Question 20

A compound with two chirality centers has a maximum of ________ possible stereoisomers.

Accepted Answer

The answer of A compound with two chirality centers has...

Exam 15: The Three-Dimensional Shape of Molecules

A compound with three chirality centers has a maximum of ________ possible stereoisomers.

Which statement is not true?

How many diastereomers can a chiral stereoisomer have?

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

The major product of the dehydration of the alcohol below has one chirality center.

How many chirality centers are present in the following molecule?

The cis and trans isomers of an alkene represent one example of stereoisomers.

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

If one enantiomer causes plane-polarized light to rotate clockwise,that enantiomer is called dextrorotatory.

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

The Fischer projection shown to the right represents the enantiomer of the three-dimensional structure to the left.

Enantiomers are mirror images that are not superimposable.

Benazepril (structure shown)is a medication that has been used to treat high blood pressure. There are ________ chirality centers in benzaepril.

Which property of enantiomers is not identical?

The drug Thalidomide was ________.

Which molecule is an enantiomer of the one shown below?

Propranol,shown below,is a chiral compound that exists as a pair of enantiomers. One enantiomer is used to treat irregular heartbeats,and the other enantiomer is used as a contraceptive. Identify the chirality center(s)in Propranol.

Which molecule is chiral?

All tertiary alcohols (3°)are chiral.

A compound with two chirality centers has a maximum of ________ possible stereoisomers.

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

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

Filters

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