Question 1

Match each definition to a term from the list below.
-Describes organic molecules which rotate plane-polarized light.

Accepted Answer

A)  racemates
B)  chirality center
C)  chirality
D)  diastereomers
E)  enantiomersF) meso compoundsG) optically activeH) prochirality centerI) optically inactiveJ) achiralK) chirality center or meso compoundsL) enantiomers or optically activeM) optically active or optically inactive

Question 2

Consider the structure of streptimidone below to answer the following question(s).  streptimidone
-Refer to instructions. Does streptimidone have a meso stereoisomer? Explain.

Accepted Answer

No. Meso compounds are compounds that contain chirality centers but possess a plane of symmetry. Because the substituents on each chiral carbon are different in streptimidone, it is impossible for any stereoisomer to have a plane of symmetry.

Question 3

How many stereoisomers of 3-chloro-2-methylbutane exist?

Accepted Answer

A)   1
B)   2
C)   3
D)   4

Question 4

Match each definition to a term from the list below.
-Describes an sp3-hybridized atom that can become a chirality center by changing one of its attached groups.

Accepted Answer

A)  racemates
B)  chirality center
C)  chirality
D)  diastereomers
E)  enantiomersF) meso compoundsG) optically activeH) prochirality centerI) optically inactiveJ) achiralK) chirality center or meso compoundsL) enantiomers or optically activeM) optically active or optically inactive

Question 5

Consider the structure of streptimidone below to answer the following question(s).  streptimidone
-Refer to instructions. Assign R or S configuration to each chirality center indicated in streptimidone.

Accepted Answer

The answer of Consider the structure of streptimidone below to...

Question 6

Place asterisks at all the chirality centers in each molecule below.
-Rank the following substituent groups from highest to lowest priority according to the sequencing rules.
CO2CH3 CO2H OH Cl

Accepted Answer

Cl > OH > ...

Question 7

The biological importance of enantiomers arises from?

Accepted Answer

A)   Biological reactions involve receptor molecules.
B)   Biological receptors are chiral.
C)   Biological receptors require a specific enantiomer for reaction.
D)   Each enantiomer has different biological properties.
E)   all of these E

Question 8

Which of the following correctly describes a molecule that is achiral?

Accepted Answer

A)   Non-superimposability of the molecule on its mirror image
B)   Superimposability of the molecule on its mirror image
C)   Contains a carbon atom with four different substituents
D)   Does not have a plane of symmetry
E)   Both b and d

Question 9

Which of the following physical properties can be used to identify a compound?

Accepted Answer

A)   R
B)   S
C)   α
D)   [α]D

Question 10

Which of the following has a plane of symmetry?

Accepted Answer

A)   boot
B)   laboratory beaker
C)   hammer
D)   both b and c
E)   none of these

Question 11

Which of the following statements is true regarding pairs of enantiomers?

Accepted Answer

A)   They have identical melting points
B)   They have identical boiling points.
C)   They rotate plane-polarized light in opposite directions
D)   They produce different products in reactions with chiral reagents
E)   all of these

Question 12

How many stereoisomers of 3-bromo-2-butanol exist?

Accepted Answer

A)   1
B)   2
C)   3
D)   4

Question 13

Place asterisks at all the chirality centers in each molecule below.
-Place asterisks:  ephedrine

Accepted Answer

The answer of Place asterisks at all the chirality centers...

Question 14

Place asterisks at all the chirality centers in each molecule below.
-Place asterisks:  cephalexin

Accepted Answer

The answer of Place asterisks at all the chirality centers...

Question 15

What is the relationship between the following pair of structures?

Accepted Answer

A)   They are enantiomers
B)   They are diastereomers
C)   The are constitutional isomers
D)   They are identical

Question 16

What is the relationship between the following pair of structures?

Accepted Answer

A)   They are enantiomers
B)   They are diastereomers
C)   The are constitutional isomers
D)   They are identical

Question 17

Place asterisks at all the chirality centers in each molecule below.
-Place asterisks:  codeine

Accepted Answer

The answer of Place asterisks at all the chirality centers...

Question 18

In the molecules below, assign R, S configurations to the chirality center indicated with an arrow.   norepinephrine
alanine
-Refer to instructions. The configuration of this carbon atom is _____.

Accepted Answer

The answer of In the molecules below, assign R, S...

Question 19

Which of the following structures is (are)  chiral?

Accepted Answer

A)  
B)  
C)  
D)

Question 20

Which of the following structures represent the same stereoisomer? A  B  C  ​

Accepted Answer

A)   only A and B
B)   only A and C
C)   only B and C
D)   A, B, and C

Exam 5: Stereochemistry at Tetrahedral Centers

Match each definition to a term from the list below. -Describes organic molecules which rotate plane-polarized light.

Correct AnswerverifiedShow Answer

Consider the structure of streptimidone below to answer the following question(s). streptimidone -Refer to instructions. Does streptimidone have a meso stereoisomer? Explain.

Correct AnswerverifiedNo. Meso compounds are compounds that contain chirality centers but possess a plane of symmetry. Because the substituents on each chiral carbon are different in streptimidone, it is impossible for any stereoisomer to have a plane of symmetry.

How many stereoisomers of 3-chloro-2-methylbutane exist?

Correct AnswerverifiedShow Answer

Match each definition to a term from the list below. -Describes an sp3-hybridized atom that can become a chirality center by changing one of its attached groups.

Correct AnswerverifiedShow Answer

Consider the structure of streptimidone below to answer the following question(s). streptimidone -Refer to instructions. Assign R or S configuration to each chirality center indicated in streptimidone.

Correct Answerverified11eab600_0887_47d3_9625_592f32ecb88f_TB6688_00

Place asterisks at all the chirality centers in each molecule below. -Rank the following substituent groups from highest to lowest priority according to the sequencing rules. CO2CH3 CO2H OH Cl

Correct AnswerverifiedCl > OH > ...View AnswerShow Answer

The biological importance of enantiomers arises from?

Correct AnswerverifiedE

Which of the following correctly describes a molecule that is achiral?

Correct AnswerverifiedShow Answer

Which of the following physical properties can be used to identify a compound?

Correct AnswerverifiedShow Answer

Which of the following has a plane of symmetry?

Correct AnswerverifiedShow Answer

Which of the following statements is true regarding pairs of enantiomers?

Correct AnswerverifiedShow Answer

How many stereoisomers of 3-bromo-2-butanol exist?

Correct AnswerverifiedShow Answer

Place asterisks at all the chirality centers in each molecule below. -Place asterisks: ephedrine

Correct AnswerverifiedShow Answer

Place asterisks at all the chirality centers in each molecule below. -Place asterisks: cephalexin

Correct AnswerverifiedShow Answer

What is the relationship between the following pair of structures?

Correct AnswerverifiedShow Answer

What is the relationship between the following pair of structures?

Correct AnswerverifiedShow Answer

Place asterisks at all the chirality centers in each molecule below. -Place asterisks: codeine

Correct AnswerverifiedShow Answer

In the molecules below, assign R, S configurations to the chirality center indicated with an arrow. norepinephrine alanine -Refer to instructions. The configuration of this carbon atom is _____.

Correct AnswerverifiedShow Answer

Which of the following structures is (are) chiral?

Correct AnswerverifiedShow Answer

Which of the following structures represent the same stereoisomer? A B C ​

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
No. Meso compounds are compounds that contain chirality centers but possess a plane of symmetry. Because the substituents on each chiral carbon are different in streptimidone, it is impossible for any stereoisomer to have a plane of symmetry.

Correct Answer
verified

Match each definition to a term from the list below. -Describes an sp³-hybridized atom that can become a chirality center by changing one of its attached groups.

Correct Answer
verified

Correct Answer
verified
11eab600_0887_47d3_9625_592f32ecb88f_TB6688_00

Place asterisks at all the chirality centers in each molecule below. -Rank the following substituent groups from highest to lowest priority according to the sequencing rules. CO₂CH₃ CO₂H OH Cl

Correct Answer
verified
Cl > OH > ...
View Answer

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following structures represent the same stereoisomer? A B C

Correct Answer
verified