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Which structure represents (S) -2-bromobutane? Which structure represents (S) -2-bromobutane? A) I B) II C) III D) More than one of these choices. E) None of these choices.


A) I
B) II
C) III
D) More than one of these choices.
E) None of these choices.

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

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Which compound does NOT possess a plane of symmetry? Which compound does NOT possess a plane of symmetry? A) I,II and V B) I,III and IV C) II,III and IV D) III and IV E) V


A) I,II and V
B) I,III and IV
C) II,III and IV
D) III and IV
E) V

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

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What is the percent composition of a mixture of (S) -(+) -2-butanol,[ α\alpha ] What is the percent composition of a mixture of (S) -(+) -2-butanol,[ \alpha ] <sub> </sub> <sup> </sup> = +13.52,and (R) -(-) -2-butanol,[ \alpha ] <sub> </sub> <sup> </sup>= -13.52,with a specific rotation [ \alpha ] <sub> </sub> <sup> </sup> = +6.76? A) 75% (R) ,25% (S) B) 25% (R) ,75% (S) C) 50% (R) ,50% (S) D) 67% (R) ,33% (S) E) 33% (R) ,67% (S) = +13.52,and (R) -(-) -2-butanol,[ α\alpha ] What is the percent composition of a mixture of (S) -(+) -2-butanol,[ \alpha ] <sub> </sub> <sup> </sup> = +13.52,and (R) -(-) -2-butanol,[ \alpha ] <sub> </sub> <sup> </sup>= -13.52,with a specific rotation [ \alpha ] <sub> </sub> <sup> </sup> = +6.76? A) 75% (R) ,25% (S) B) 25% (R) ,75% (S) C) 50% (R) ,50% (S) D) 67% (R) ,33% (S) E) 33% (R) ,67% (S) = -13.52,with a specific rotation [ α\alpha ] What is the percent composition of a mixture of (S) -(+) -2-butanol,[ \alpha ] <sub> </sub> <sup> </sup> = +13.52,and (R) -(-) -2-butanol,[ \alpha ] <sub> </sub> <sup> </sup>= -13.52,with a specific rotation [ \alpha ] <sub> </sub> <sup> </sup> = +6.76? A) 75% (R) ,25% (S) B) 25% (R) ,75% (S) C) 50% (R) ,50% (S) D) 67% (R) ,33% (S) E) 33% (R) ,67% (S) = +6.76?


A) 75% (R) ,25% (S)
B) 25% (R) ,75% (S)
C) 50% (R) ,50% (S)
D) 67% (R) ,33% (S)
E) 33% (R) ,67% (S)

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

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Draw a dash-wedge structure for (R)-3-methyl-5-hexen-3-ol

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A sample consisting of the pure R enantiomer of a compound will always rotate plane-polarized light in a clockwise direction.

A) True
B) False

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Draw a dash-wedge structure for (2R,3S)-2-bromo-3-chlorohexane

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Which molecule is a meso compound? Which molecule is a meso compound? A) I B) II C) III D) More than one of these choices. E) None of these choices.


A) I
B) II
C) III
D) More than one of these choices.
E) None of these choices.

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

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Draw a dash-wedge structure for (1S,2S,5R)-5-methyl-2-propylcyclohexanol

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What is the correct stereochemistry for the indicated stereocenters in (+) -camphor? What is the correct stereochemistry for the indicated stereocenters in (+) -camphor? A) 1R,4R B) 1R,4S C) 1S,4S D) 1S,4R E) None,molecule is not chiral.


A) 1R,4R
B) 1R,4S
C) 1S,4S
D) 1S,4R
E) None,molecule is not chiral.

F) All of the above
G) A) and C)

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The molecules below are: The molecules below are: A) constitutional isomers. B) enantiomers. C) diastereomers. D) identical. E) stereoisomers.


A) constitutional isomers.
B) enantiomers.
C) diastereomers.
D) identical.
E) stereoisomers.

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

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A diastereomeric mixture can be very difficult to purify as both isomers have the same physical properties.

A) True
B) False

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I and II are: I and II are: A) constitutional isomers. B) enantiomers. C) identical. D) diastereomers. E) not isomeric.


A) constitutional isomers.
B) enantiomers.
C) identical.
D) diastereomers.
E) not isomeric.

F) A) and E)
G) A) and D)

Correct Answer

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I and II are: I and II are: A) constitutional isomers. B) enantiomers. C) identical. D) diastereomers. E) not isomeric.


A) constitutional isomers.
B) enantiomers.
C) identical.
D) diastereomers.
E) not isomeric.

F) B) and D)
G) A) and B)

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A chiral molecule was found to have a specific rotation of +19.5,thus we can conclude that the enantiomer of this compound will have a rotation that is equal and opposite in value.

A) True
B) False

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The molecules below are: The molecules below are: A) enantiomers. B) diastereomers. C) constitutional isomers. D) two different conformations of the same molecule. E) not isomeric.


A) enantiomers.
B) diastereomers.
C) constitutional isomers.
D) two different conformations of the same molecule.
E) not isomeric.

F) C) and E)
G) B) and C)

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If a solution of a compound (30.0 g/100 mL of solution) has a measured rotation of +15º in a 2.0 dm tube,the specific rotation is:


A) +50
B) +25
C) +15
D) +7.5
E) +4.0

F) B) and E)
G) A) and E)

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I and II are: I and II are: A) constitutional isomers. B) enantiomers. C) identical. D) diastereomers. E) not isomeric.


A) constitutional isomers.
B) enantiomers.
C) identical.
D) diastereomers.
E) not isomeric.

F) A) and D)
G) B) and D)

Correct Answer

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Draw a dash-wedge structure for (3S,5R)-5-chloro-3-isopropylcyclohex-1-ene

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How many stereogenic centers are in the following compound: How many stereogenic centers are in the following compound: A) 1 B) 3 C) 4 D) 5 E) none of these choices


A) 1
B) 3
C) 4
D) 5
E) none of these choices

F) B) and D)
G) B) and E)

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Which compound would show optical activity?


A) cis-1,4-Dimethylcyclohexane
B) trans-1,4-Dimethylcyclohexane
C) cis-1,4-Dimethylcycloheptane
D) trans-1,4-Dimethylcycloheptane
E) More than one of these choices.

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

Correct Answer

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Showing 61 - 80 of 179

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