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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

Correct Answer

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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

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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.

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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

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

Correct Answer

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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

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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°

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D

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

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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.

Correct Answer

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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

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

Correct Answer

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C

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

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


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

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D

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.

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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

Correct Answer

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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

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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

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

Correct Answer

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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

Correct Answer

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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.

Correct Answer

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