Question 1

Is the molecule shown below chiral or achiral?

Accepted Answer

chiral

Question 2

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

Accepted Answer

the same compound

Question 3

Label each asymmetric carbon in the compound below as R or S.

Accepted Answer

The answer of Label each asymmetric carbon in the compound...

Question 4

Can one separate a mixture of enantiomers by gas chromatography? Explain.

Accepted Answer

Provided the compounds can be volatilize

Question 5

Which of the statements below correctly describes an achiral molecule?

Accepted Answer

A)  The molecule has a nonsuperimposable mirror image. 
B)  The molecule exhibits optical activity when it interacts with plane-polarized light. 
C)  The molecule has an enantiomer. 
D)  The molecule might be a meso form. 
E)  None of the above 
A)  The molecule has a nonsuperimposable mirror image. 
B)  The molecule exhibits optical activity when it interacts with plane-polarized light. 
C)  The molecule has an enantiomer. 
D)  The molecule might be a meso form. 
E)  None of the above

Question 6

Can the two compounds be separated by distillation? Why or why not?
(1S,2S,3R,5S)-Pinanediol and (1S,2R,3R,5R)-Pinanediol

Accepted Answer

Yes. These compounds

Question 7

Assign the proper configurational label, R or S, to the chiral carbon in the molecule shown below.

Accepted Answer

The answer of Assign the proper configurational label, R or...

Question 8

If possible, draw the structure of the enantiomer of the molecule shown below.

Accepted Answer

The compound is an a

Question 9

The stereochemical configuration of D-Threonine is (2R, 3S). Which of the following structures corresponds to the correct configuration?

Accepted Answer

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

Question 10

How many asymmetric carbons are present in the compound below?

Accepted Answer

The answer of How many asymmetric carbons are present in...

Question 11

Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane.

Accepted Answer

The answer of Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane....

Question 12

Is the mirror image of the following molecule an enantiomer or is it superimposable with it?

Accepted Answer

Superimpos

Question 13

Is it theoretically possible to separate the pair of compounds below by distillation? Explain briefly.

Accepted Answer

Yes. The molecules a

Question 14

Which of the following statements is (are) true for the compound (3R, 4R)-3,4-dimethylhexane?

Accepted Answer

A)  This compound is chiral. 
B)  The enantiomer of this compound is (3S, 4S)-3,4-dimethylhexane. 
C)  This compound is a diastereomer of (3R, 4S)-3,4-dimethylhexane. 
D)  all of the above 
E)  none of the above 
A)  This compound is chiral. 
B)  The enantiomer of this compound is (3S, 4S)-3,4-dimethylhexane. 
C)  This compound is a diastereomer of (3R, 4S)-3,4-dimethylhexane. 
D)  all of the above 
E)  none of the above

Question 15

Predict the specific rotation of the compound shown.

Accepted Answer

A)  It is impossible to predict; it must be determined experimentally. 
B)  Because both asymmetric centers are R, the compound is dextrorotatory. 
C)  Because both asymmetric centers are S, the compound is levorotatory. 
D)  Zero; the compound is achiral. 
E)  Because this compound represents a racemic mixture, the compound is dextrorotatory. 
A)  It is impossible to predict; it must be determined experimentally. 
B)  Because both asymmetric centers are R, the compound is dextrorotatory. 
C)  Because both asymmetric centers are S, the compound is levorotatory. 
D)  Zero; the compound is achiral. 
E)  Because this compound represents a racemic mixture, the compound is dextrorotatory.

Question 16

What term describes the structural relationship between (2R,3R,4S)-2,3,4-trichloroheptane and (2R,3R,4R)-2,3,4-trichloroheptane?

Accepted Answer

A)  not isomers 
B)  constitutional isomers 
C)  enantiomers 
D)  diastereomers 
E)  conformers 
A)  not isomers 
B)  constitutional isomers 
C)  enantiomers 
D)  diastereomers 
E)  conformers

Question 17

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

Accepted Answer

The answer of Which of the following terms best describes...

Question 18

Which of the following statements is (are) true for the compound cis-1,2-dichlorocyclopropane?

Accepted Answer

A)  This compound is chiral. 
B)  The enantiomer of this compound is trans-1,2-dichlorocyclopropane. 
C)  This compound contains no asymmetric carbons. 
D)  all of the above 
E)  none of the above 
A)  This compound is chiral. 
B)  The enantiomer of this compound is trans-1,2-dichlorocyclopropane. 
C)  This compound contains no asymmetric carbons. 
D)  all of the above 
E)  none of the above

Question 19

________ are isomers which have the same bonding sequence but differ in the orientation of their atoms in space.

Accepted Answer

The answer of ________ are isomers which have the same...

Question 20

Draw the structure of (S)-3-chloro-3-methylhexane. Take particular care to indicate stereochemistry properly.

Accepted Answer

The answer of Draw the structure of (S)-3-chloro-3-methylhexane. Take particular...

Exam 5: Stereochemistry

Is the molecule shown below chiral or achiral?

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

Label each asymmetric carbon in the compound below as R or S.

Can one separate a mixture of enantiomers by gas chromatography? Explain.

Which of the statements below correctly describes an achiral molecule?

Can the two compounds be separated by distillation? Why or why not? (1S,2S,3R,5S)-Pinanediol and (1S,2R,3R,5R)-Pinanediol

Assign the proper configurational label, R or S, to the chiral carbon in the molecule shown below.

If possible, draw the structure of the enantiomer of the molecule shown below.

The stereochemical configuration of D-Threonine is (2R, 3S). Which of the following structures corresponds to the correct configuration?

How many asymmetric carbons are present in the compound below?

Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane.

Is the mirror image of the following molecule an enantiomer or is it superimposable with it?

Is it theoretically possible to separate the pair of compounds below by distillation? Explain briefly.

Which of the following statements is (are) true for the compound (3R, 4R)-3,4-dimethylhexane?

Predict the specific rotation of the compound shown.

What term describes the structural relationship between (2R,3R,4S)-2,3,4-trichloroheptane and (2R,3R,4R)-2,3,4-trichloroheptane?

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound?

Which of the following statements is (are) true for the compound cis-1,2-dichlorocyclopropane?

________ are isomers which have the same bonding sequence but differ in the orientation of their atoms in space.

Draw the structure of (S)-3-chloro-3-methylhexane. Take particular care to indicate stereochemistry properly.

Structure and Bonding

Acids and Bases; Functional Groups

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Alkyl Halides; Nucleophilic Substitution

Structure and Synthesis of Alkenes; Elimination

Reactions of Alkenes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Carbohydrates and Nucleic Acids

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

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