Question 1

What is the total number of compounds,stereoisomers included,designated by the general name "dichlorocyclopentane"?

Accepted Answer

A)  4 
B)  5 
C)  7 
D)  8 
E)  9 
A)  4 
B)  5 
C)  7 
D)  8 
E)  9

Question 2

Which compound does NOT possess a plane of symmetry?

Accepted Answer

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

Question 3

CH3CHBrCH2CHClCH3 is the generalized representation of what number of stereoisomers?

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  6 
E)  7 
A)  3 
B)  4 
C)  5 
D)  6 
E)  7

Question 4

Draw a dash-wedge structure for (1R,3R)-1,3-dibromo-1,3-dimethylcyclohexane

Accepted Answer

The answer of Draw a dash-wedge structure for (1R,3R)-1,3-dibromo-1,3-dimethylcyclohexane...

Question 5

What is the complete IUPAC name of the following substance? (Remember to give stereochemical details,as relevant. )

Accepted Answer

(1R,3S)-1-

Question 6

Enantiomers have ______________ physical properties.

Accepted Answer

The answer of Enantiomers have ______________ physical properties....

Question 7

Which of the following is(are)meso compound(s)?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  Both II and III 
E)  Both I and III 
A)  I 
B)  II 
C)  III 
D)  Both II and III 
E)  Both I and III

Question 8

Draw a dash-wedge structure for (2S,3S)-3-methylpent-4-en-2-ol

Accepted Answer

The answer of Draw a dash-wedge structure for (2S,3S)-3-methylpent-4-en-2-ol...

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

How many optically active compounds are represented by the following generalized formula?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 11

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

Question 12

What can be said with certainty if a compound has [$\alpha$]     = -9.25 ?

Accepted Answer

A)  The compound has the (S)configuration. 
B)  The compound has the (R)configuration. 
C)  The compound is not a meso form. 
D)  The compound possesses only one stereogenic center. 
E)  The compound has an optical purity of less than 100%. 
A)  The compound has the (S)configuration. 
B)  The compound has the (R)configuration. 
C)  The compound is not a meso form. 
D)  The compound possesses only one stereogenic center. 
E)  The compound has an optical purity of less than 100%.

Question 13

In the absence of specific data,it can only be said that (R)-2-bromopentane is:

Accepted Answer

A)  dextrorotatory (+). 
B)  levorotatory (-). 
C)  optically inactive. 
D)  achiral. 
E)  analogous in absolute configuration to (R)-2-chloropentane. 
A)  dextrorotatory (+). 
B)  levorotatory (-). 
C)  optically inactive. 
D)  achiral. 
E)  analogous in absolute configuration to (R)-2-chloropentane.

Question 14

Which structure represents (R)-1-chloro-1-fluoroethane?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  More than one of the above 
E)  None of the above 
A)  I 
B)  II 
C)  III 
D)  More than one of the above 
E)  None of the above

Question 15

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 16

Which molecule is achiral?

Accepted Answer

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

Question 17

Which of the following represent (R)-2-butanol?

Accepted Answer

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

Question 18

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 
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

Question 19

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

Accepted Answer

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

Question 20

Which reaction must take place with retention of configuration at the stereogenic center?

Accepted Answer

A) 
  
B) 
  
C) 
  
D)  More than one of the above 
E)  None of the above 
A) 
  
B) 
  
C) 
  
D)  More than one of the above 
E)  None of the above

Exam 5: Stereochemistry: Chiral Molecules

What is the total number of compounds,stereoisomers included,designated by the general name "dichlorocyclopentane"?

Which compound does NOT possess a plane of symmetry?

CH3CHBrCH2CHClCH3 is the generalized representation of what number of stereoisomers?

Draw a dash-wedge structure for (1R,3R)-1,3-dibromo-1,3-dimethylcyclohexane

What is the complete IUPAC name of the following substance? (Remember to give stereochemical details,as relevant. )

Enantiomers have ______________ physical properties.

Which of the following is(are)meso compound(s)?

Draw a dash-wedge structure for (2S,3S)-3-methylpent-4-en-2-ol

I and II are:

How many optically active compounds are represented by the following generalized formula?

Pairs of enantiomers are:

What can be said with certainty if a compound has [ α\alphaα ] = -9.25 ?

In the absence of specific data,it can only be said that (R)-2-bromopentane is:

Which structure represents (R)-1-chloro-1-fluoroethane?

I and II are:

Which molecule is achiral?

Which of the following represent (R)-2-butanol?

Which of the following molecules is achiral?

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

Which reaction must take place with retention of configuration at the stereogenic center?

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

Filters

CH₃CHBrCH₂CHClCH₃ is the generalized representation of what number of stereoisomers?

What can be said with certainty if a compound has [ $\alpha$ ] $What can be said with certainty if a compound has [ \alpha ] <sub> </sub> = -9.25 ?$ = -9.25 ?