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


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

E) All of the above
F) None of the above

Correct Answer

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The terms that best describe the relationship between (2R,3S)-2,3-butanediol and (2S,3S)-2,3-butanediol are configurational and diastereomers.

A) True
B) False

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Which of the following Newman projections represents (2R,3R) -dibromobutane? Which of the following Newman projections represents (2R,3R) -dibromobutane? A) 1 B) 2 C) 3 D) 4


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

E) B) and C)
F) A) and B)

Correct Answer

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

Correct Answer

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How many isomers (constitutional and stereoisomers) exist for dimethylpentane?


A) 2
B) 3
C) 4
D) 5

E) A) and B)
F) A) and C)

Correct Answer

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How many isomers (constitutional and stereoisomers) exist for dimethylcyclopentane?


A) 3
B) 5
C) 7
D) 9

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

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An unknown sample is tested with a polarimeter for optical activity. The results of the test required no movement of the analyzer. This sample could be either a meso compound or a racemic mixture.

A) True
B) False

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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.

A) True
B) False

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

Correct Answer

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Which of the following structures has a center of symmetry (i.e., center of inversion) ? Which of the following structures has a center of symmetry (i.e., center of inversion) ? A) 1 B) 2 C) 3 D) 4


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

E) A) and B)
F) None of the above

Correct Answer

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


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 rotations

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

Correct Answer

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What is the relationship between the following pair of structures? What is the relationship between the following pair of structures? A) They are enantiomers B) They are diastereomers C) The are constitutional isomers D) They are identical


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

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

Correct Answer

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Which of the following structures is chiral? Which of the following structures is chiral? A) 1 B) 2 C) 3 D) 4


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

E) A) and D)
F) A) and B)

Correct Answer

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

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Which of the following structures is different from the other three? Which of the following structures is different from the other three? A) 1 B) 2 C) 3 D) 4


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

E) A) and C)
F) A) and B)

Correct Answer

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


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 rotations

E) B) and D)
F) None of the above

Correct Answer

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

Correct Answer

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Which of the following is the definition of chirality?


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 image

E) A) and C)
F) A) and B)

Correct Answer

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Which of the following Newman projections represents meso-2,3-dibromobutane? Which of the following Newman projections represents meso-2,3-dibromobutane? A) 1 B) 2 C) 3 D) 4


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

E) A) and D)
F) None of the above

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 20% of the S isomer?


A) 1 g
B) 2 g
C) 4 g
D) 6 g

E) All of the above
F) None of the above

Correct Answer

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Showing 61 - 80 of 95

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