Question 1

How many stereoisomers of 2,4-pentanediol, CH3CH(OH) CH2CH(OH) CH3, exist?

Accepted Answer

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

Question 2

What is "X" in the following structure? ​

Accepted Answer

A)   Inversion center
B)   Plane of symmetry
C)   Center of symmetry
D)   Point of symmetryE) All of the above
F) A) and D)

Question 3

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

Accepted Answer

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

Question 4

A mixture containing 0.50 mmol of each enantiomer is called a ___________mixture.

Accepted Answer

The answer of A mixture containing 0.50 mmol of each...

Question 5

Which of the following have the S configuration?

Accepted Answer

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

Question 6

Which of the following substituents has the highest priority according to the Cahn-Ingold-Prelog system used in assigning R and S configurations?

Accepted Answer

A)   −COOH
B)   −CHO
C)   −CH2OH
D)   −CH3E) B) and C)
F) B) and D)

Question 7

The following two compounds represent a pair of enantiomers.

Accepted Answer

A) True 
 B)False

Question 8

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 D)
F) B) and C)

Question 9

What mass of (S)-(-)-mandelic acid is present in a 10 g sample which has an enantiomeric excess of 30% of the S-enantiomer?

Accepted Answer

The answer of What mass of (S)-(-)-mandelic acid is present...

Question 10

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

Accepted Answer

A)   −50°
B)   −20°
C)   +10°
D)   +50°E) A) and C)
F) None of the above

Question 11

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

Question 12

The following structures depicts (__)-3-ethyl-2,3-dimethylhexane.

Accepted Answer

The answer of The following structures depicts (__)-3-ethyl-2,3-dimethylhexane. ...

Question 13

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

Accepted Answer

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

Question 14

The number of chiral centers in progesterone (shown below) is ______.

Accepted Answer

The answer of The number of chiral centers in progesterone...

Question 15

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

Accepted Answer

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

Question 16

______________ are stereoisomers that are not mirror images.

Accepted Answer

Diastereom...

Question 17

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

Accepted Answer

Question 18

The process that separates enantiomers is called ______________.

Accepted Answer

The answer of The process that separates enantiomers is called...

Question 19

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 20

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

Accepted Answer

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

Exam 3: Stereoisomerism and Chirality

A mixture containing 0.50 mmol of each enantiomer is called a ___________mixture.

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Which of the following have the S configuration?

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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 2,3-butanediol, CH3CH(OH) CH(OH) CH3, exist?

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

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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 (2S,3S)-2,3-butanediol.

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What is "X" in the following structure? ​

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

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What mass of (S)-(-)-mandelic acid is present in a 10 g sample which has an enantiomeric excess of 30% of the S-enantiomer?

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The following structures depicts (__)-3-ethyl-2,3-dimethylhexane.

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The process that separates enantiomers is called ______________.

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______________ are stereoisomers that are not mirror images.

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Which of the following structures represent the same stereoisomer?

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Which of the following compounds is/are chiral?

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

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Which of the following substituents has the highest priority according to the Cahn-Ingold-Prelog system used in assigning R and S configurations?

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The number of chiral centers in progesterone (shown below) is ______.

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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°. What is the specific rotation of the R isomer?

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How many stereoisomers of 2,4-pentanediol, CH3CH(OH) CH2CH(OH) CH3, exist?

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

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

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What is "X" in the following structure?

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Diastereom...
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How many stereoisomers of 2,4-pentanediol, CH₃CH(OH) CH₂CH(OH) CH₃, exist?

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