Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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)  "-CH3"E) A) and D)
F) A) and C)

Question 4

How many stereoisomers of 2,4-dimethylpentane, (CH3) 2CHCH2CH(CH3) 2, exist?

Accepted Answer

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

Question 5

Complete the following diagram so that it represents (S)-2-butanol.

Accepted Answer

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

Question 6

The process that separates enantiomers is called ______________.

Accepted Answer

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

Question 7

A natural product having [$\alpha$]D = +40.3$\circ$ has been isolated and purified. Either of the following substances could be this natural product.

Accepted Answer

A) True 
 B)False

Question 8

How many stereoisomers of 4-chloro-2-methylpentane (CH3) 2CHCH2CHClCH3, exist?

Accepted Answer

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

Question 9

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking)  
1.-C-CH
2.-CH2NH2
3.-NHCH3
4) -CN

Accepted Answer

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

Question 10

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) None of the above
F) B) and C)

Question 11

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) B) and C)
F) A) and D)

Question 12

______________ are stereoisomers that are not mirror images.

Accepted Answer

Diastereom...

Question 13

The absolute configurations around C-2 and C-3 in the following Fischer projection are, respectively, ____. (Enter the two configurations separated by a comma.)

Accepted Answer

The answer of The absolute configurations around C-2 and C-3...

Question 14

Which of the following structures is different from the other three?

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

Which of the following structures does not have a plane of symmetry?

Accepted Answer

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

Question 17

Which of the following is the definition of chirality?

Accepted Answer

A)  The non-superposability of an object on its mirror image
B)  The superposability of an object on its mirror image
C)  A molecule that has a carbon atom with four different substituents
D)  A molecule with a mirror imageE) A) and C)
F) C) and D)

Question 18

How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 60% of the R isomer?

Accepted Answer

A)  2 g
B)  4 g
C)  6 g
D)  8 gE) All of the above
F) A) and B)

Question 19

Which of the following Newman projections represents (2R,3R) -dibromobutane?

Accepted Answer

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

Question 20

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

Accepted Answer

A)  A pair of structures that are superposable mirror images of one another
B)  A pair of stereoisomers that are non-superposable 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 C)

Exam 3: Stereoisomerism and Chirality

Which of the following structures does not have a plane of symmetry?

Correct Answer
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How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 60% of the R isomer?

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

Correct Answer
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Which of the following have the S configuration?

Correct Answer
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How many stereoisomers of 2,4-dimethylpentane, (CH₃) ₂CHCH₂CH(CH₃) ₂, exist?

Correct Answer
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Which of the following Newman projections represents (2R,3R) -dibromobutane?

Correct Answer
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______________ are stereoisomers that are not mirror images.

Correct Answer
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Diastereom...
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Which of the following is the definition of chirality?

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

Correct Answer
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Complete the following diagram so that it represents (S)-2-butanol.

Correct Answer
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Which of the following compounds is/are chiral?

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

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

Correct Answer
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How many stereoisomers of 4-chloro-2-methylpentane (CH₃) ₂CHCH₂CHClCH₃, exist?

Correct Answer
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What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) 1.-C-CH 2.-CH₂NH₂ 3.-NHCH₃ 4) -CN

Correct Answer
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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?

Correct Answer
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The absolute configurations around C-2 and C-3 in the following Fischer projection are, respectively, ____. (Enter the two configurations separated by a comma.)

Correct Answer
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Which of the following structures is different from the other three?

Correct Answer
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The process that separates enantiomers is called ______________.

Correct Answer
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Exam 3: Stereoisomerism and Chirality

Which of the following structures does not have a plane of symmetry?

Correct AnswerverifiedShow Answer

How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 60% of the R isomer?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following have the S configuration?

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How many stereoisomers of 2,4-dimethylpentane, (CH3) 2CHCH2CH(CH3) 2, exist?

Correct AnswerverifiedShow Answer

Which of the following Newman projections represents (2R,3R) -dibromobutane?

Correct AnswerverifiedShow Answer

______________ are stereoisomers that are not mirror images.

Correct AnswerverifiedDiastereom...View AnswerShow Answer

Which of the following is the definition of chirality?

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

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Complete the following diagram so that it represents (S)-2-butanol.

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Which of the following compounds is/are chiral?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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How many stereoisomers of 4-chloro-2-methylpentane (CH3) 2CHCH2CHClCH3, exist?

Correct AnswerverifiedShow Answer

A natural product having [ α\alphaα ]D = +40.3 ∘\circ∘ has been isolated and purified. Either of the following substances could be this natural product.

Correct AnswerverifiedShow Answer

What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) 1.-C-CH 2.-CH2NH2 3.-NHCH3 4) -CN

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The absolute configurations around C-2 and C-3 in the following Fischer projection are, respectively, ____. (Enter the two configurations separated by a comma.)

Correct AnswerverifiedShow Answer

Which of the following structures is different from the other three?

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The process that separates enantiomers is called ______________.

Correct AnswerverifiedShow Answer

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How many stereoisomers of 2,4-dimethylpentane, (CH₃) ₂CHCH₂CH(CH₃) ₂, exist?

Correct Answer
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Diastereom...
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How many stereoisomers of 4-chloro-2-methylpentane (CH₃) ₂CHCH₂CHClCH₃, exist?

Correct Answer
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Correct Answer
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What is the correct order of the Cahn-Ingold-Prelog ranking of the following substituents as used in assigning R and S configurations of chiral centers? (higher ranking > lower ranking) 1.-C-CH 2.-CH₂NH₂ 3.-NHCH₃ 4) -CN

Correct Answer
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