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What is the percent ee of a mixture that has 70% of one enantiomer and 30% of the other?


A) 70
B) 85
C) 40
D) 30

E) All of the above
F) C) and D)

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A reaction mixture is three parts of one enantiomer and one part of the other.What is the percent ee of this mixture?


A) 75
B) 40
C) 65
D) 50

E) None of the above
F) B) and C)

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What is the total number of possible stereoisomers for the following molecule? What is the total number of possible stereoisomers for the following molecule? A) 2 B) 4 C) 6 D) 8


A) 2
B) 4
C) 6
D) 8

E) All of the above
F) None of the above

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Which of the following compounds does not have a plane of symmetry? Which of the following compounds does not have a plane of symmetry? A) Only I and II B) Only II C) Only III and IV D) Only I, II, and IV


A) Only I and II
B) Only II
C) Only III and IV
D) Only I, II, and IV

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

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


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

E) A) and B)
F) A) and C)

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D

What is the relationship between the following compounds? What is the relationship between the following compounds? A) Constitutional isomers B) Diastereomers C) Enantiomers D) Identical


A) Constitutional isomers
B) Diastereomers
C) Enantiomers
D) Identical

E) B) and C)
F) A) and C)

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Which of the following molecules are achiral? Which of the following molecules are achiral? A) II, III B) I, II C) I, IV D) III, IV


A) II, III
B) I, II
C) I, IV
D) III, IV

E) None of the above
F) C) and D)

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Which of the following statements is true?


A) Achiral molecules usually contain a plane of symmetry.
B) With one tetrahedral stereogenic center, a molecule may or may not be chiral.
C) With two or more stereogenic centers, a molecule is always chiral.
D) Chiral molecules usually contain a plane of symmetry.

E) None of the above
F) C) and D)

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A solution containing 0.08 g/mL of a pure R enantiomer in a 1 dm polarimeter rotates plane polarized light by +4°.What is the specific rotation of the S enantiomer?


A) +50°
B) -40°
C) +40°
D) -50°

E) A) and B)
F) None of the above

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D

Which of the following statements is true?


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) All of the above
F) A) and D)

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Which of the following cyclic molecules is a meso compound? Which of the following cyclic molecules is a meso compound? A) I B) II C) III D) IV


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

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

Correct Answer

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How many stereogenic centers are present in the following molecule? How many stereogenic centers are present in the following molecule? A) 1 B) 2 C) 4 D) 5


A) 1
B) 2
C) 4
D) 5

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

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How many stereogenic centers are present in ephedrine, a bronchodilator and decongestant? How many stereogenic centers are present in ephedrine, a bronchodilator and decongestant? A) 0 B) 1 C) 2 D) 3


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

E) C) and D)
F) A) and D)

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Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system. Rank the following groups in order of decreasing priority according to the Cahn-Ingold-Prelog system. A) I > III > IV > II B) III > IV > I > II C) IV > III > I > II D) IV > I > III > II


A) I > III > IV > II
B) III > IV > I > II
C) IV > III > I > II
D) IV > I > III > II

E) A) and B)
F) A) and C)

Correct Answer

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


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) C) and D)
F) None of the above

Correct Answer

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


A) 2
B) 3
C) 4
D) 6

E) A) and D)
F) A) and B)

Correct Answer

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C

How many stereogenic centers are present in the following compound? How many stereogenic centers are present in the following compound? A) 0 B) 1 C) 2 D) 3


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

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

Correct Answer

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


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) All of the above
F) B) and D)

Correct Answer

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What is the relationship between the following compounds? What is the relationship between the following compounds? A) Constitutional isomers B) Diastereomers C) Enantiomers D) Identical


A) Constitutional isomers
B) Diastereomers
C) Enantiomers
D) Identical

E) A) and D)
F) A) and C)

Correct Answer

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What is the relationship between the following compounds? What is the relationship between the following compounds? A) Constitutional isomers B) Diastereomers C) Enantiomers D) Identical


A) Constitutional isomers
B) Diastereomers
C) Enantiomers
D) Identical

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

Correct Answer

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