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

Correct Answer

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


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

E) C) and D)
F) B) and D)

Correct Answer

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

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How many stereoisomers of 2,3-dimethylbutane, (CH3) 2CHCH(CH3) 2, exist?


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

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

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

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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) C) 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 60% of the R isomer?


A) 2 g
B) 4 g
C) 6 g
D) 8 g

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

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

Correct Answer

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


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

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Which of the following structures represent the same stereoisomer? Which of the following structures represent the same stereoisomer? A) only 1 and 2 B) only 1 and 3 C) only 2 and 3 D) 1, 2 and 3


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

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

Correct Answer

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How many stereoisomers of 4-bromo-2-pentanol, CH3CH(OH) CH2CHBrCH3, exist?


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

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

Correct Answer

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

Correct Answer

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How many stereogenic centers are there in the following molecule (the naturally occurring stereoisomer is the male hormone testosterone) ? How many stereogenic centers are there in the following molecule (the naturally occurring stereoisomer is the male hormone testosterone) ? A) Three B) Four C) Six D) Seven


A) Three
B) Four
C) Six
D) Seven

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

Correct Answer

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

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

Correct Answer

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

Correct Answer

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What is the configuration of the two chiral centers in the following molecule? What is the configuration of the two chiral centers in the following molecule? A) 3R,5R B) 3R,5S C) 3S,5R D) 3S,5S


A) 3R,5R
B) 3R,5S
C) 3S,5R
D) 3S,5S

E) B) and D)
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) B) and D)
F) B) and C)

Correct Answer

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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 B)
F) None of the above

Correct Answer

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

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