Question 1

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

Accepted Answer

(3S,4S)-3,

Question 2

(2R,4S)-2,4-Dichloropentane and (2S,4R)-2,4-dichloropentane are:

Accepted Answer

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

Question 3

How many stereogenic centers are there in Lovastatin (Mevacor®,a cholesterol-lowering drug)?

Accepted Answer

A) 4 
B) 5 
C) 6 
D) 7 
E) 8 
A) 4 
B) 5 
C) 6 
D) 7 
E) 8

Question 4

Draw a dash-wedge structure for (1R,4R)-1,4-dibromo-1-chloro-1-fluoropentane

Accepted Answer

The answer of Draw a dash-wedge structure for (1R,4R)-1,4-dibromo-1-chloro-1-fluoropentane...

Question 5

A molecule must possess at least one stereogenic center to be a chiral molecule.

Accepted Answer

A) True 
 B)False

Question 6

Draw a dash-wedge structure for (2R,3R)-3-phenylbutan-2-ol

Accepted Answer

The answer of Draw a dash-wedge structure for (2R,3R)-3-phenylbutan-2-ol...

Question 7

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 8

What is the IUPAC name of the following compound?

Accepted Answer

(1S,6S)-2,

Question 9

What is the enantiomeric excess of a compound that shows a specific rotation [$\alpha$]       = +18.6,where the pure enantiomer has a reference value of [$\alpha$]    
  = +24.8?

Accepted Answer

A) 6.6% 
B) 21.5% 
C) 50% 
D) 75% 
E) 0%,racemic mixture 
A) 6.6% 
B) 21.5% 
C) 50% 
D) 75% 
E) 0%,racemic mixture

Question 10

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 11

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 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

Which of the following reactions must occur with retention of configuration?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 14

The molecules below are:

Accepted Answer

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

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

Draw a dash-wedge structure for (3R,6R)-3-bromo-6-methylcyclohex-1-ene

Accepted Answer

The answer of Draw a dash-wedge structure for (3R,6R)-3-bromo-6-methylcyclohex-1-ene...

Question 17

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 18

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

Accepted Answer

(2S,4S)-4-

Question 19

Which of these is a comparatively insignificant factor affecting the magnitude of specific optical rotation?

Accepted Answer

A) concentration of the substance of interest 
B) purity of the sample 
C) temperature of the measurement 
D) length of the sample tube 
E) All of these choices are equally significant. 
A) concentration of the substance of interest 
B) purity of the sample 
C) temperature of the measurement 
D) length of the sample tube 
E) All of these choices are equally significant.

Question 20

What is IUPAC name of the following compound?

Accepted Answer

A) (R)-2-methyl-3-butyn-1-ol 
B) (S)-2-methyl-3-butyn-1-ol 
C) (R)-2-methyl-1-butyn-3-ol 
D) (S)-2-methyl-1-butyn-3-ol 
E) None of these choices 
A) (R)-2-methyl-3-butyn-1-ol 
B) (S)-2-methyl-3-butyn-1-ol 
C) (R)-2-methyl-1-butyn-3-ol 
D) (S)-2-methyl-1-butyn-3-ol 
E) None of these choices

Exam 5: Stereochemistry

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

(2R,4S)-2,4-Dichloropentane and (2S,4R)-2,4-dichloropentane are:

How many stereogenic centers are there in Lovastatin (Mevacor®,a cholesterol-lowering drug)?

Draw a dash-wedge structure for (1R,4R)-1,4-dibromo-1-chloro-1-fluoropentane

A molecule must possess at least one stereogenic center to be a chiral molecule.

Draw a dash-wedge structure for (2R,3R)-3-phenylbutan-2-ol

I and II are:

What is the IUPAC name of the following compound?

What is the enantiomeric excess of a compound that shows a specific rotation [ α\alphaα ] = +18.6,where the pure enantiomer has a reference value of [ α\alphaα ] = +24.8?

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

I and II are:

I and II are:

Which of the following reactions must occur with retention of configuration?

The molecules below are:

I and II are:

Draw a dash-wedge structure for (3R,6R)-3-bromo-6-methylcyclohex-1-ene

CH3CHBrCH2CHClCH3 is the generalized representation of what number of stereoisomers?

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

Which of these is a comparatively insignificant factor affecting the magnitude of specific optical rotation?

What is IUPAC name of the following compound?

The Basics

Families of Carbon

Acids and Bases

Nomenclature and Conformations of Alkanes and Cycloalkanes

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Nuclear Magnetic Resonance and Mass Spectrometry

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

CH₃CHBrCH₂CHClCH₃ is the generalized representation of what number of stereoisomers?