Question 1

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

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) All of the above
F) C) and D)

Question 2

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 identicalE) None of the above
F) All of the above

Question 3

If (+) -sucrose has a specific rotation of +66.47,what is the specific rotation of (-) -sucrose?

Accepted Answer

A)  +66.47
B)  -66.47
C)  +33.43
D)  -33.43
E)  Must be determined with a polarimeter.F) A) and B)
G) B) and E)

Question 4

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

Accepted Answer

A)  R
B)  S
C)  a
D)  [a]DE) B) and D)
F) B) and C)

Question 5

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 dF) C) and D)
G) B) and D)

Question 6

2.10 g of an unknown compound was dissolved in 15.00 mL of ethanol.The sample was placed in a 10.0 cm cell in a polarimeter and the angle of rotation was determined to be -18.48$\circ$.What is the specific rotation of this unknown and specify if the compound is levorotatory or dextrorotatory?

Accepted Answer

-132 and levorotatory

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 theseF) B) and C)
G) A) and E) E

Question 8

(-) -cholesterol

Accepted Answer

A)  does not have a chiral center.
B)  is dextrorotatory.
C)  rotates the plane of polarized light counterclockwise.
D)  does not rotate polarized light.E) A) and D)
F) B) and D)

Question 9

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 theseF) All of the above
G) B) and C)

Question 10

Instructions: Identify the indicated hydrogens in the following molecules as pro-R or pro-S.
Identify:

Accepted Answer

The answer of Instructions: Identify the indicated hydrogens in the...

Question 11

Which of the following is the definition of a pair of diastereomers?

Accepted Answer

A)  A pair of structures that are superimposable mirror images of one another
B)  A pair of stereoisomers that are non-superimposable mirror images of one another
C)  A pair of stereoisomers that are not mirror images of one another
D)  A pair of stereoisomers that have equal specific rotationsE) A) and B)
F) A) and D)

Question 12

Which of the following is the definition of a pair of enantiomers?

Accepted Answer

A)  A pair of structures that are superimposable mirror images of one another
B)  A pair of stereoisomers that are non-superimposable mirror images of one another
C)  A pair of stereoisomers that are not mirror images of one another
D)  A pair of stereoisomers that have equal specific rotationsE) A) and C)
F) All of the above

Question 13

Instructions: Consider the structure of streptimidone below to answer the following question(s).

-Refer to instructions.Assign R or S configuration to each chirality center indicated in streptimidone.

Accepted Answer

The answer of Instructions: Consider the structure of streptimidone below...

Question 14

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 identicalE) B) and C)
F) C) and D)

Question 15

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

Accepted Answer

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

Question 16

The following atoms are commonly encountered in organic molecules.For which is it not possible to isolate enantiomers due to rapid inversion?

Accepted Answer

A)  trivalent phosphorus
B)  trivalent nitrogen
C)  divalent sulfur
D)  trivalent sulfur
E)  both b and cF) B) and C)
G) C) and E)

Question 17

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

Accepted Answer

The answer of Instructions: Place asterisks at all the chirality...

Question 18

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

Accepted Answer

The answer of Instructions: Place asterisks at all the chirality...

Question 19

Which of the following structures represent the same stereoisomer?

Accepted Answer

A)  only 1 and 2
B)  only 1 and 3
C)  only 2 and 3
D)  1,2 and 3E) A) and C)
F) B) and C)

Question 20

Which of the following structures contain a plane of symmetry?

Accepted Answer

A)  1
B)  2
C)  3
D)  All three contain a plane of symmetryE) B) and D)
F) B) and C)

Exam 5: Stereochemistry at Tetrahedral Centers

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

Correct AnswerverifiedShow Answer

What is the relationship between the following pair of structures?

Correct AnswerverifiedShow Answer

If (+) -sucrose has a specific rotation of +66.47,what is the specific rotation of (-) -sucrose?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

2.10 g of an unknown compound was dissolved in 15.00 mL of ethanol.The sample was placed in a 10.0 cm cell in a polarimeter and the angle of rotation was determined to be -18.48 ∘\circ∘ .What is the specific rotation of this unknown and specify if the compound is levorotatory or dextrorotatory?

Correct Answerverified-132 and levorotatory

The biological importance of enantiomers arises from?

Correct AnswerverifiedE

(-) -cholesterol

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Instructions: Identify the indicated hydrogens in the following molecules as pro-R or pro-S. Identify:

Correct AnswerverifiedShow Answer

Which of the following is the definition of a pair of diastereomers?

Correct AnswerverifiedShow Answer

Which of the following is the definition of a pair of enantiomers?

Correct AnswerverifiedShow Answer

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

Correct Answerverified11ea7ca1_4b25_0f33_9d3f_d93ae24a3a01_TB4938_00

What is the relationship between the following pair of structures?

Correct AnswerverifiedShow Answer

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

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The following atoms are commonly encountered in organic molecules.For which is it not possible to isolate enantiomers due to rapid inversion?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following structures represent the same stereoisomer?

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Which of the following structures contain a plane of symmetry?

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2.10 g of an unknown compound was dissolved in 15.00 mL of ethanol.The sample was placed in a 10.0 cm cell in a polarimeter and the angle of rotation was determined to be -18.48^$\circ$.What is the specific rotation of this unknown and specify if the compound is levorotatory or dextrorotatory?

Correct Answer
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-132 and levorotatory

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11ea7ca1_4b25_0f33_9d3f_d93ae24a3a01_TB4938_00

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