Question 1

Give the IUPAC name for the following compound:

Accepted Answer

A)  (1R,3R) -1-ethyl-3-methylcyclohexane
B)  (1R,3S) -1-ethyl-3-methylcyclohexane
C)  (1S,3R) -1-ethyl-3-methylcyclohexane
D)  (1S,3S) -1-ethyl-3-methylcyclohexaneE) A) and C)
F) B) and C)

Question 2

Which of the following statements is true?

Accepted Answer

A)  Enantiomers are mirror images that are not superimposable.
B)  A molecule that is superimposable on its mirror image is chiral.
C)  A chiral molecule usually contains a plane of symmetry.
D)  An achiral molecule does not contain a plane of symmetry.E) A) and B)
F) A) and C) A

Question 3

What is the main carbohydrate in the seeds and roots of plants?

Accepted Answer

A)  Starch
B)  Glucose
C)  Cellulose
D)  GlycogenE) B) and C)
F) A) and D)

Question 4

Which of the following compounds is identical to compound A?

Accepted Answer

A)  I and II
B)  II and III
C)  I and III
D)  IIE) All of the above
F) A) and B)

Question 5

If a mixture has an ee of 90%,what is the percentage of each enantiomer?

Accepted Answer

A)  65% : 35%
B)  55% : 45%
C)  80% : 20%
D)  95% : 5%E) None of the above
F) C) and D)

Question 6

Give the IUPAC name for the following compound:

Accepted Answer

A)  R-2,3-dimethylhexane
B)  S-2,3-dimethylhexane
C)  R-4,5-dimethylhexane
D)  S-4,5-dimethylhexaneE) None of the above
F) B) and C)

Question 7

Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system.  II > III > IV B) II > I > IV > III C) II > I > III > IV D) I > II > IV > III" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I > II > III > IV
B)  II > I > IV > III
C)  II > I > III > IV
D)  I > II > IV > IIIE) A) and C)
F) A) and B)

Question 8

How many stereogenic centers are present in the following compound?

Accepted Answer

A)  0
B)  1
C)  2
D)  3E) A) and B)
F) None of the above

Question 9

Which of the following compounds is a meso compound?

Accepted Answer

A)  (2R,3S) -dichlorobutane
B)  (2R,3R) -dichlorobutane
C)  (2R,3S) -3-chloro-2-butanol
D)  (2R,3R) -3-chloro-2-butanolE) A) and D)
F) All of the above

Question 10

How many chiral stereoisomers can be drawn for dimethycyclopropane?

Accepted Answer

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

Question 11

What is the relationship between the following compounds?

Accepted Answer

A)  Constitutional isomers
B)  Diastereomers
C)  Enantiomers
D)  IdenticalE) None of the above
F) A) and C)

Question 12

Which of the following structures has the R configuration?

Accepted Answer

A)  Only I
B)  Only II
C)  Only I and II
D)  I,II,and IIIE) C) and D)
F) A) and B)

Question 13

Which of the following is the correct definition for a pair of enantiomers?

Accepted Answer

A)  A pair of stereoisomers that have a plane of symmetry.
B)  A pair of stereoisomers that are not mirror images of each other.
C)  A pair of stereoisomers that are not superimposable mirror images of each other.
D)  A pair of stereoisomers that are superimposable mirror images of each other.E) A) and B)
F) C) and D)

Question 14

How many isomers (constitutional and stereoisomers) exist for dimethylcyclobutane?

Accepted Answer

A)  3
B)  4
C)  5
D)  6E) None of the above
F) B) and C)

Question 15

How many isomers can be drawn (constitutional and stereoisomers) for dimethycyclopropane?

Accepted Answer

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

Question 16

Which of the following statements about starch and cellulose is true?

Accepted Answer

A)  Starch and cellulose are not stereoisomers.
B)  In cellulose,the O atom joins two rings using one equatorial and one axial bond.
C)  In starch,the O atom joins two rings using two equatorial bonds.
D)  In cellulose,the O atom joins two rings using two equatorial bonds.E) A) and D)
F) B) and D)

Question 17

What is the relationship between the following two compounds?

Accepted Answer

A)  Constitutional isomers
B)  Stereoisomers
C)  Identical
D)  Not isomers,different compoundsE) B) and C)
F) All of the above

Question 18

Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system.  III > I > II B) IV > I > III > II C) III > IV > I > II D) II > I > III > IV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  IV > III > I > II
B)  IV > I > III > II
C)  III > IV > I > II
D)  II > I > III > IVE) All of the above
F) B) and D) A

Question 19

How many stereoisomers of 1,3-dibromocyclopentane exist?

Accepted Answer

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

Question 20

How much of the R enantiomer is present in 10 g of a mixture that has an enantiomeric excess of 30% of the S isomer?

Accepted Answer

A)  3) 0 g
B)  3) 5 g
C)  6) 5 g
D)  7) 0 gE) A) and B)
F) All of the above

Exam 5: Stereochemistry

Give the IUPAC name for the following compound:

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedA

What is the main carbohydrate in the seeds and roots of plants?

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Which of the following compounds is identical to compound A?

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If a mixture has an ee of 90%,what is the percentage of each enantiomer?

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Give the IUPAC name for the following compound:

Correct AnswerverifiedShow Answer

Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system.

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How many stereogenic centers are present in the following compound?

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Which of the following compounds is a meso compound?

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How many chiral stereoisomers can be drawn for dimethycyclopropane?

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What is the relationship between the following compounds?

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Which of the following structures has the R configuration?

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Which of the following is the correct definition for a pair of enantiomers?

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How many isomers (constitutional and stereoisomers) exist for dimethylcyclobutane?

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How many isomers can be drawn (constitutional and stereoisomers) for dimethycyclopropane?

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Which of the following statements about starch and cellulose is true?

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What is the relationship between the following two compounds?

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Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system.

Correct AnswerverifiedA

How many stereoisomers of 1,3-dibromocyclopentane exist?

Correct AnswerverifiedC

How much of the R enantiomer is present in 10 g of a mixture that has an enantiomeric excess of 30% of the S isomer?

Correct AnswerverifiedShow Answer

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