Question 1

For the compound shown below the number of chiral stereoisomers that can be drawn is_____.
CH3CHClCHBrCH3

Accepted Answer

Question 2

Complete the following zig-zag structure so that it represents (2R,3R)-3-chlorobutan-2-ol.

Accepted Answer

The answer of Complete the following zig-zag structure so that...

Question 3

Complete the following diagram so that it represents (R)-2-bromobutane.

Accepted Answer

The answer of Complete the following diagram so that it...

Question 4

Which of the following is the best definition of a pair of atropisomers?

Accepted Answer

A)  A pair of enantiomers which do not interconvert.
B)  A pair of enantiomers which lack chiral centers.
C)  A pair of enantiomeric structures which lack chiral centers and interconvert by rotation around carbon-carbon single bonds.
D)  A pair of enantiomers which lack chiral centers and do not interconvert because of hindered rotation around carbon-carbon single bonds.E) A) and C)
F) None of the above

Question 5

Complete the following Newman projection so that it represents (2R,3R)-2,3-dibromobutane.

Accepted Answer

The answer of Complete the following Newman projection so that...

Question 6

How many stereoisomers of 3-chloro-2-methylbutane, (CH3) 2CHCHClCH3, exist?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) None of the above
F) C) and D)

Question 7

A solution containing 0.04 g/mL of a pure S enantiomer in a 1 dm polarimeter rotates plane polarized light by +2 ∘\circ∘ . What is the specific rotation of the R isomer?

Accepted Answer

A)  "-50 ∘\circ∘ "
B)  "-20 ∘\circ∘ "
C)  "+10 ∘\circ∘ "
D)  "+50 ∘\circ∘ " E) All of the above
F) A) and D)

Question 8

What is the configuration of the two chiral centers in the following molecule?

Accepted Answer

A)  3R,5R
B)  3R,5S
C)  3S,5R
D)  3S,5SE) A) and B)
F) A) and D)

Question 9

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) A) and B)

Question 10

Which of the following have the R configuration?

Accepted Answer

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

Question 11

How many stereoisomers of 3-bromo-2-butanol, CH3CH(OH) CHBrCH3, exist?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) C) and D)
F) None of the above

Question 12

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) All of the above
F) A) and B)

Question 13

Which of the following compounds is a meso compound?

Accepted Answer

A)  (2R,3R) -dibromobutane
B)  (2R,3S) -dibromobutane
C)  (2R,3S) -3-bromo-2-butanol
D)  (2R,3R) -3-bromo-2-butanolE) B) and C)
F) A) and D)

Question 14

Which of the following compounds is/are chiral?

Accepted Answer

A)  only 1
B)  only 1 and 2
C)  only 2 and 3
D)  1, 2 and 3E) None of the above
F) A) and B)

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 identicalE) A) and B)
F) A) and D)

Question 16

The following two compounds represent a pair of enantiomers.

Accepted Answer

A) True 
 B)False

Question 17

Complete the following Fischer diagram so that it represents (2R,3S)-butane-2,3-diol.

Accepted Answer

The answer of Complete the following Fischer diagram so that...

Question 18

In muscle tissue only (+)-lactic acid is found but in sour milk both (+)-lactic acid and (-)-lactic acid are present. This difference might be explained by the fact that the production of lactic acid in muscle tissue is catalyzed by biological catalysts or enzymes.

Accepted Answer

A) True 
 B)False

Question 19

A solution containing 0.2 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +2.8 ∘\circ∘ . What is the rotation of a solution containing 0.4 g/mL of the R isomer in the same polarimeter?

Accepted Answer

A)  +0.7 ∘\circ∘ 
B)  +1.4 ∘\circ∘ 
C)  +2.8 ∘\circ∘ 
D)  +5.6 ∘\circ∘  E) C) and D)
F) A) and D)

Question 20

How many stereoisomers of 2,3-butanediol, CH3CH(OH) CH(OH) CH3, exist?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) A) and B)
F) A) and C)

Exam 3: Stereoisomerism and Chirality

For the compound shown below the number of chiral stereoisomers that can be drawn is_____. CH3CHClCHBrCH3

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In muscle tissue only (+)-lactic acid is found but in sour milk both (+)-lactic acid and (-)-lactic acid are present. This difference might be explained by the fact that the production of lactic acid in muscle tissue is catalyzed by biological catalysts or enzymes.

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Which of the following have the R configuration?

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The following two compounds represent a pair of enantiomers.

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Complete the following Newman projection so that it represents (2R,3R)-2,3-dibromobutane.

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What is the relationship between the following pair of structures?

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How many stereoisomers of 2,3-butanediol, CH3CH(OH) CH(OH) CH3, exist?

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Which of the following compounds is/are chiral?

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A solution containing 0.2 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +2.8 ∘\circ∘ . What is the rotation of a solution containing 0.4 g/mL of the R isomer in the same polarimeter?

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Which of the following compounds is a meso compound?

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Complete the following zig-zag structure so that it represents (2R,3R)-3-chlorobutan-2-ol.

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What is the relationship between the following pair of structures?

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What is the relationship between the following pair of structures?

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Which of the following is the best definition of a pair of atropisomers?

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Complete the following Fischer diagram so that it represents (2R,3S)-butane-2,3-diol.

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A solution containing 0.04 g/mL of a pure S enantiomer in a 1 dm polarimeter rotates plane polarized light by +2 ∘\circ∘ . What is the specific rotation of the R isomer?

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How many stereoisomers of 3-chloro-2-methylbutane, (CH3) 2CHCHClCH3, exist?

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What is the configuration of the two chiral centers in the following molecule?

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How many stereoisomers of 3-bromo-2-butanol, CH3CH(OH) CHBrCH3, exist?

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Complete the following diagram so that it represents (R)-2-bromobutane.

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For the compound shown below the number of chiral stereoisomers that can be drawn is_____. CH₃CHClCHBrCH₃

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How many stereoisomers of 2,3-butanediol, CH₃CH(OH) CH(OH) CH₃, exist?

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A solution containing 0.2 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +2.8^$\circ$. What is the rotation of a solution containing 0.4 g/mL of the R isomer in the same polarimeter?

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A solution containing 0.04 g/mL of a pure S enantiomer in a 1 dm polarimeter rotates plane polarized light by +2^$\circ$. What is the specific rotation of the R isomer?

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How many stereoisomers of 3-chloro-2-methylbutane, (CH₃) ₂CHCHClCH₃, exist?

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How many stereoisomers of 3-bromo-2-butanol, CH₃CH(OH) CHBrCH₃, exist?

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