Question 1

Of the following structures, how many are classified "E"?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) D) and E)

Question 2

The terms that best describe the isomeric relationship between staggered and eclipsed ethane are

Accepted Answer

A)   configurational, achiral, diastereomers.
B)   conformational, chiral, enantiomers.
C)   conformational, achiral, diastereomers.
D)   configurational, chiral, enantiomers.
E)   conformational, achiral, enantiomers.F) B) and E)
G) A) and C) C

Question 3

An unknown sample is tested with a polarimeter for optical activity.The results of the test require movement of the analyzer.What samples would give this result?

Accepted Answer

A)   pure enantiomer
B)   meso compound
C)   racemic mixture
D)   both B and C
E)   none of theseF) All of the above
G) A) and C)

Question 4

The number of stereogenic centers in progesterone is:  progesterone (no stereochemistry shown)

Accepted Answer

A)   2
B)   3
C)   4
D)   5
E)   6F) B) and D)
G) A) and E)

Question 5

Which of the following structures is (E) -2,3-dichloro-2-pentene?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) None of the above
G) A) and E) E

Question 6

According to the R-S convention, which priority is correct for the following sets of groups?

Accepted Answer

A)   NH2 > Cl > CH3 > H
B)   Cl > NH2 > CH3 > H
C)   Cl > CH3 > NH2 > H
D)   H > Cl > CH3 > NH2
E)   CH3 > NH2 > Cl > HF) C) and D)
G) A) and E)

Question 7

The total number of possible stereoisomers of  is:

Accepted Answer

A)   2
B)   4
C)   6
D)   8
E)   0F) B) and D)
G) All of the above

Question 8

The terms that best describe the relationship between (2R,3S) -2,3-butanediol and (2S,3S) -2,3-butanediol are

Accepted Answer

A)   configurational, diastereomers.
B)   conformational, enantiomers.
C)   conformational, diastereomers
D)   configurational, enantiomers.
E)   configurational, cis/trans.F) None of the above
G) A) and D)

Question 9

Of the following structures, how many are classified "Z"?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and D)
G) A) and C)

Question 10

When (R) -3-bromo-2-methyl-1-butene is reacted with HBr, two stereoisomers are formed.What is the relationship of these stereoisomers?

Accepted Answer

A)   enantiomers
B)   meso compounds
C)   diastereomers
D)   E
E)   ZF) None of the above
G) B) and C)

Question 11

The total number of possible stereoisomers of 1-bromo-2-chlorocyclopentane is:

Accepted Answer

A)   2
B)   4
C)   6
D)   8
E)   0F) None of the above
G) A) and B) B

Question 12

The Fischer projection that represents the same molecule as  is:

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and C)
G) A) and E)

Question 13

Which of the following structures depicts (R) -3-ethyl-2,3-dimethylhexane?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and D)
G) B) and E)

Question 14

A 50:50 mixture of enantiomers

Accepted Answer

A)   is a meso form.
B)   is a pair of diastereomers.
C)   is a racemic mixture.
D)   rotates plane polarized light.
E)   is a pair of conformers.F) A) and C)
G) C) and D)

Question 15

Which name describes the following structure?

Accepted Answer

A)   (R) -4-methyl-1-hexen-4-ol
B)   (S) -4-ethyl-1-penten-4-ol
C)   (R) -4-ethyl-1-penten-3-ol
D)   (S) -4-methyl-1-hexen-4-ol
E)   (S) -4-methyl-1-hexyn-4-olF) A) and D)
G) B) and E)

Question 16

How many stereogenic carbons are produced from the following sequence of reactions?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and C)
G) A) and D)

Question 17

An unknown sample is tested with a polarimeter for optical activity.The results of the test required no movement of the analyzer.What samples would give this result?

Accepted Answer

A)   pure enantiomer
B)   meso compound
C)   racemic mixture
D)   both B and C
E)   none of theseF) D) and E)
G) None of the above

Question 18

What is correct name for the following structure?

Accepted Answer

A)   (R,S) -2,3-dichlorobutane
B)   (2R,3S) -2,3-dichlorobutane
C)   (2S,3S) -2,3-dichlorobutane
D)   (2R,3R) -2,3-dichlorobutane
E)   none of theseF) C) and E)
G) A) and E)

Question 19

How many stereogenic centers are present in the following molecule?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) A) and E)

Question 20

The Fischer projection formula for (S) -lactic acid (2-hydroxypropanoic acid)  is

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) All of the above
G) None of the above

Exam 5: Stereoisomerism

Of the following structures, how many are classified "E"?

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The terms that best describe the isomeric relationship between staggered and eclipsed ethane are

Correct AnswerverifiedC

An unknown sample is tested with a polarimeter for optical activity.The results of the test require movement of the analyzer.What samples would give this result?

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The number of stereogenic centers in progesterone is: progesterone (no stereochemistry shown)

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Which of the following structures is (E) -2,3-dichloro-2-pentene?

Correct AnswerverifiedE

According to the R-S convention, which priority is correct for the following sets of groups?

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The total number of possible stereoisomers of is:

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The terms that best describe the relationship between (2R,3S) -2,3-butanediol and (2S,3S) -2,3-butanediol are

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Of the following structures, how many are classified "Z"?

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When (R) -3-bromo-2-methyl-1-butene is reacted with HBr, two stereoisomers are formed.What is the relationship of these stereoisomers?

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The total number of possible stereoisomers of 1-bromo-2-chlorocyclopentane is:

Correct AnswerverifiedB

The Fischer projection that represents the same molecule as is:

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Which of the following structures depicts (R) -3-ethyl-2,3-dimethylhexane?

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A 50:50 mixture of enantiomers

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Which name describes the following structure?

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How many stereogenic carbons are produced from the following sequence of reactions?

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An unknown sample is tested with a polarimeter for optical activity.The results of the test required no movement of the analyzer.What samples would give this result?

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What is correct name for the following structure?

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How many stereogenic centers are present in the following molecule?

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The Fischer projection formula for (S) -lactic acid (2-hydroxypropanoic acid) is

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C

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E

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B

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