Question 1

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 2

Draw a dash-wedge structure for (3R,4S)-4,6-dimethylheptan-3-ol

Accepted Answer

The answer of Draw a dash-wedge structure for (3R,4S)-4,6-dimethylheptan-3-ol...

Question 3

The Cahn-Ingold-Prelog stereochemical designations used for the following substance are:

Accepted Answer

A) 2R,4S 
B) 2S,4R 
C) 2R,4R 
D) 2S,4S 
E) The "R,S" terminology doesn't apply in this case. 
A) 2R,4S 
B) 2S,4R 
C) 2R,4R 
D) 2S,4S 
E) The "R,S" terminology doesn't apply in this case.

Question 4

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 5

Which of the following is (are)meso?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) Two of these choices. 
A) I 
B) II 
C) III 
D) IV 
E) Two of these choices.

Question 6

Draw a dash-wedge structure for (3S,4R)-4-fluoro-2,4-dimethylheptan-3-ol

Accepted Answer

The answer of Draw a dash-wedge structure for (3S,4R)-4-fluoro-2,4-dimethylheptan-3-ol...

Question 7

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 8

The two compounds shown below are:

Accepted Answer

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

Question 9

The compounds whose structures 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. 
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 10

What is the IUPAC name of the following compound?

Accepted Answer

A) (1R,3R,5R)-1-bromo-3-chloro-5-fluorocyclohexane 
B) (1R,3R,5S)-1-bromo-3-chloro-5-fluorocyclohexane 
C) (1S,3S,5R)-1-bromo-3-chloro-5-fluorocyclohexane 
D) (1S,3S,5S)-1-bromo-3-chloro-5-fluorocyclohexane 
E) None of these choices. 
A) (1R,3R,5R)-1-bromo-3-chloro-5-fluorocyclohexane 
B) (1R,3R,5S)-1-bromo-3-chloro-5-fluorocyclohexane 
C) (1S,3S,5R)-1-bromo-3-chloro-5-fluorocyclohexane 
D) (1S,3S,5S)-1-bromo-3-chloro-5-fluorocyclohexane 
E) None of these choices.

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

The molecules shown are:

Accepted Answer

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

Question 13

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

Accepted Answer

(3R,4S)-4-

Question 14

Draw a dash-wedge structure for (1R)-1-bromo-1,3,3-trimethylcyclohexane

Accepted Answer

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

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 (1S,3R)-1-ethyl-1,3-dimethylcyclopentane

Accepted Answer

The answer of Draw a dash-wedge structure for (1S,3R)-1-ethyl-1,3-dimethylcyclopentane...

Question 17

The name of the compound formed when 1,2-dimethylcyclohexene is treated with H2 in Pd/C is:

Accepted Answer

A) cis-1,2-dimethylcyclohexane 
B) trans-1,2-dimethylcyclohexane 
C) mixture of cis- and trans-1,2-dimethylcyclohexane 
D) meso-1,2-dimethylcyclohexane 
E) none of these choices 
A) cis-1,2-dimethylcyclohexane 
B) trans-1,2-dimethylcyclohexane 
C) mixture of cis- and trans-1,2-dimethylcyclohexane 
D) meso-1,2-dimethylcyclohexane 
E) none of these choices

Question 18

Which molecule is a meso compound?

Accepted Answer

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

Question 19

Which of the following is the enantiomer of the following substance?

Accepted Answer

A) I 
B) II 
C) III 
D) It does not have a non-superposable enantiomer. 
E) Both II and III. 
A) I 
B) II 
C) III 
D) It does not have a non-superposable enantiomer. 
E) Both II and III.

Question 20

Which of the following compounds (I-IV)represent enantiomers?

Accepted Answer

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

Exam 5: Stereochemistry

I and II are:

Draw a dash-wedge structure for (3R,4S)-4,6-dimethylheptan-3-ol

The Cahn-Ingold-Prelog stereochemical designations used for the following substance are:

I and II are:

Which of the following is (are)meso?

Draw a dash-wedge structure for (3S,4R)-4-fluoro-2,4-dimethylheptan-3-ol

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

The two compounds shown below are:

The compounds whose structures are shown below would have:

What is the IUPAC name of the following compound?

I and II are:

The molecules shown are:

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

Draw a dash-wedge structure for (1R)-1-bromo-1,3,3-trimethylcyclohexane

I and II are:

Draw a dash-wedge structure for (1S,3R)-1-ethyl-1,3-dimethylcyclopentane

The name of the compound formed when 1,2-dimethylcyclohexene is treated with H2 in Pd/C is:

Which molecule is a meso compound?

Which of the following is the enantiomer of the following substance?

Which of the following compounds (I-IV)represent enantiomers?

The Basics

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Nomenclature and Conformations of Alkanes and Cycloalkanes

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Filters

The name of the compound formed when 1,2-dimethylcyclohexene is treated with H₂ in Pd/C is: