Question 1

Which of these is not a correct Fischer projection formula of the (S) form of 3-bromo-1,1-dichloro-2-propanol?

Accepted Answer

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

Question 2

Which is a meso compound?

Accepted Answer

A)  (2R,3R) -2,3-Dibromobutane
B)  (2R,3S) -2,3-Dibromopentane
C)  (2R,4R) -2,4-Dibromopentane
D)  (2R,4S) -2,4-Dibromopentane
E)  (2R,4S) -2,4-Dibromohexane

Question 3

The molecules below are:

Accepted Answer

A)  constitutional isomers.
B)  enantiomers.
C)  diastereomers.
D)  identical.
E)  None of these choices.

Question 4

Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethyloct-7-en-2-ol

Accepted Answer

The answer of Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethyloct-7-en-2-ol...

Question 5

The molecule  is properly named:

Accepted Answer

A)  (3R,4S,5R) -3,5-Dichloro-4-methylhexane
B)  (2S,3S,4S) -2,4-Dichloro-3-methylhexane
C)  (2S,3R,4R) -2,4-Dichloro-3-methylhexane
D)  (2S,3R,4S) -2,4-Dichloro-3-methylhexane
E)  (2S,3S,4R) -2,4-Dichloro-3-methylhexane

Question 6

The molecules below are:

Accepted Answer

A)  constitutional isomers.
B)  enantiomers.
C)  diastereomers.
D)  identical.
E)  None of these choices.

Question 7

How is it possible to differentiate compounds in a racemic mixture?

Accepted Answer

A)  by distilling of one isomer from the other
B)  through the use of IR spectroscopy
C)  chemical conversion to a diastereomeric mixture
D)  how the mixture rotates in plane polarized light
E)  it is impossible to differentiate the two compounds

Question 8

To be superposable,when one object is placed on top of another,___.

Accepted Answer

all parts ...

Question 9

Pairs of enantiomers are:

Accepted Answer

A)  I,II and III,IV
B)  I,II
C)  III,IV
D)  IV,V
E)  None of the structures.

Question 10

Which compound (I-IV) is a meso compound?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  None of these choices.

Question 11

Which molecule has a plane of symmetry?

Accepted Answer

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

Question 12

I and II are:

Accepted Answer

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

Question 13

The molecules shown are:

Accepted Answer

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

Question 14

A solution of which of these allenes will rotate plane-polarized light?

Accepted Answer

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

Question 15

For the generalized structure BrCH2CHClCH2CHClCH2Br there exists what number of stereoisomers?

Accepted Answer

A)  2
B)  3
C)  4
D)  6
E)  8

Question 16

Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne

Accepted Answer

The answer of Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne...

Question 17

Which of the following molecules is achiral?

Accepted Answer

A)  (2R,3R) -2,3-Dichloropentane
B)  (2R,3S) -2,3-Dichloropentane
C)  (2S,4S) -2,4-Dichloropentane
D)  (2S,4R) -2,4-Dichloropentane
E)  Two of these choices.

Question 18

The compounds whose molecules are shown below would have:

Accepted Answer

A)  the same melting point.
B)  different melting points.
C)  equal but opposite optical rotations.
D)  More than one of these choices.
E)  None of these choices.

Question 19

The molecules below are:

Accepted Answer

A)  constitutional isomers.
B)  enantiomers.
C)  diastereomers.
D)  identical.
E)  None of these choices.

Question 20

If a sample is said to contain a 98.0% enantiomeric excess of the compound (+)-camphor,what would be the observed specific rotation if the pure (+)-camphor was found to have a rotation of 44.1?

Accepted Answer

The answer of If a sample is said to contain...

Exam 5: Stereochemistry

I and II are:

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For the generalized structure BrCH2CHClCH2CHClCH2Br there exists what number of stereoisomers?

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How is it possible to differentiate compounds in a racemic mixture?

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Which is a meso compound?

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The molecules below are:

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Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne

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The compounds whose molecules are shown below would have:

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To be superposable,when one object is placed on top of another,___.

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Which compound (I-IV) is a meso compound?

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Which of the following molecules is achiral?

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The molecules below are:

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If a sample is said to contain a 98.0% enantiomeric excess of the compound (+)-camphor,what would be the observed specific rotation if the pure (+)-camphor was found to have a rotation of 44.1?

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A solution of which of these allenes will rotate plane-polarized light?

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The molecules shown are:

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Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethyloct-7-en-2-ol

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The molecule is properly named:

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Which molecule has a plane of symmetry?

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Pairs of enantiomers are:

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The molecules below are:

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Which of these is not a correct Fischer projection formula of the (S) form of 3-bromo-1,1-dichloro-2-propanol?

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For the generalized structure BrCH₂CHClCH₂CHClCH₂Br there exists what number of stereoisomers?

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all parts ...
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