Question 1

Enantiomers are:

Accepted Answer

A)  molecules that have a mirror image. 
B)  molecules that have at least one stereogenic center. 
C)  non-superposable molecules. 
D)  non-superposable constitutional isomers. 
E)  non-superposable molecules that are mirror images of each other. 
A)  molecules that have a mirror image. 
B)  molecules that have at least one stereogenic center. 
C)  non-superposable molecules. 
D)  non-superposable constitutional isomers. 
E)  non-superposable molecules that are mirror images of each other.

Question 2

The molecules below are:

Accepted Answer

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

Question 3

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

Question 4

Draw a dash-wedge structure for (2R,3S)-2-chloro-3-methylpentane

Accepted Answer

The answer of Draw a dash-wedge structure for (2R,3S)-2-chloro-3-methylpentane...

Question 5

Which of the following is true about any (R)-enantiomer?

Accepted Answer

A)  It is dextrorotatory. 
B)  It is levorotatory. 
C)  It is an equal mixture of + and -. 
D)  It is the mirror image of the (S)-enantiomer. 
E)  (R)indicates a racemic mixture. 
A)  It is dextrorotatory. 
B)  It is levorotatory. 
C)  It is an equal mixture of + and -. 
D)  It is the mirror image of the (S)-enantiomer. 
E)  (R)indicates a racemic mixture.

Question 6

An achiral molecule is one that is __________________ upon its mirror image.

Accepted Answer

The answer of An achiral molecule is one that is...

Question 7

The molecules below are:

Accepted Answer

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

Question 8

Which of the following substances is achiral ?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  More than one of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  More than one of these

Question 9

I and II are:

Accepted Answer

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

Question 10

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

Question 11

Which of the following is NOT true of enantiomers? They have the same:

Accepted Answer

A)  boiling point. 
B)  melting point. 
C)  specific rotation. 
D)  density. 
E)  chemical reactivity toward achiral reagents. 
A)  boiling point. 
B)  melting point. 
C)  specific rotation. 
D)  density. 
E)  chemical reactivity toward achiral reagents.

Question 12

I and II are:

Accepted Answer

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

Question 13

I and II are:

Accepted Answer

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

Question 14

The structures   represent:

Accepted Answer

A)  a single compound. 
B)  enantiomers. 
C)  meso forms. 
D)  diastereomers. 
E)  conformational isomers. 
A)  a single compound. 
B)  enantiomers. 
C)  meso forms. 
D)  diastereomers. 
E)  conformational isomers.

Question 15

Draw a dash-wedge structure for (S,trans)-5-fluoro-2,2-dimethylhex-3-ene

Accepted Answer

The answer of Draw a dash-wedge structure for (S,trans)-5-fluoro-2,2-dimethylhex-3-ene...

Question 16

I and II are:

Accepted Answer

A)  constitutional isomers. 
B)  enantiomers. 
C)  non-superposable mirror images. 
D)  diastereomers. 
E)  not isomeric. 
A)  constitutional isomers. 
B)  enantiomers. 
C)  non-superposable mirror images. 
D)  diastereomers. 
E)  not isomeric.

Question 17

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

Accepted Answer

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

Question 18

(R)-2-Chlorobutane is represented by:

Accepted Answer

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

Question 19

The The molecules shown are:

Accepted Answer

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

Question 20

Which one of the following can exist in optically active forms?

Accepted Answer

A)  cis-1,3-Dichlorocyclohexane 
B)  trans-1,3-Dichlorocyclohexane 
C)  cis-1,4-Dichlorocyclohexane 
D)  trans-1,4-Dichlorocyclohexane 
E)  cis-1,2-Dichlorocyclohexane 
A)  cis-1,3-Dichlorocyclohexane 
B)  trans-1,3-Dichlorocyclohexane 
C)  cis-1,4-Dichlorocyclohexane 
D)  trans-1,4-Dichlorocyclohexane 
E)  cis-1,2-Dichlorocyclohexane

Exam 5: Stereochemistry: Chiral Molecules

Enantiomers are:

The molecules below are:

The compounds whose molecules are shown below would have:

Draw a dash-wedge structure for (2R,3S)-2-chloro-3-methylpentane

Which of the following is true about any (R)-enantiomer?

An achiral molecule is one that is __________________ upon its mirror image.

The molecules below are:

Which of the following substances is achiral ?

I and II are:

The compounds whose molecules are shown below would have:

Which of the following is NOT true of enantiomers? They have the same:

I and II are:

I and II are:

The structures represent:

Draw a dash-wedge structure for (S,trans)-5-fluoro-2,2-dimethylhex-3-ene

I and II are:

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

(R)-2-Chlorobutane is represented by:

The The molecules shown are:

Which one of the following can exist in optically active forms?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

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