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Give the IUPAC name for the following compound: Give the IUPAC name for the following compound: 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-methylcyclohexane


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-methylcyclohexane

E) All of the above
F) A) and B)

Correct Answer

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How many stereoisomers can be drawn for a molecule with formula CH3CH(OH) CH(OH) CH3?


A) 1
B) 2
C) 3
D) 4

E) All of the above
F) A) and B)

Correct Answer

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Which of the following statements is not true?


A) A molecule that is superimposable on its mirror image is said to achiral.
B) A molecule that is not superimposable on its mirror image is said to be chiral.
C) A molecule that is superimposable on its mirror image is said to be chiral.
D) A carbon atom bonded to four different groups is a stereogenic center.

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

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

Correct Answer

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

Correct Answer

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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?


A) 3) 0 g
B) 3) 5 g
C) 6) 5 g
D) 7) 0 g

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

Correct Answer

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

Correct Answer

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Which of the following compounds is a meso compound?


A) (2R,3S) -dichlorobutane
B) (2R,3R) -dichlorobutane
C) (2R,3S) -3-chloro-2-butanol
D) (2R,3R) -3-chloro-2-butanol

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

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Which of the following is the definition for a pair of diastereomers?


A) A pair of stereoisomers with stereogenic centers but is not chiral.
B) A pair of stereoisomers that are superimposable 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 not mirror images of each other.

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

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

Correct Answer

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Which of the following structures has the S configuration? Which of the following structures has the S configuration? A) Only I B) Only II C) Only I and II D) I,II,and III


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

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

Correct Answer

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What is the relationship between the following two compounds? What is the relationship between the following two compounds? A) Constitutional isomers B) Stereoisomers C) Identical D) Not isomers,different compounds


A) Constitutional isomers
B) Stereoisomers
C) Identical
D) Not isomers,different compounds

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

Correct Answer

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Give the IUPAC name for the following compound: Give the IUPAC name for the following compound: A) (1R,2R) -1,2-dimethylcyclopentane B) (1R,2S) -1,2-dimethylcyclopentane C) (1S,2R) -1,2-dimethylcyclopentane D) (1S,2S) -1,2-dimethylcyclopentane


A) (1R,2R) -1,2-dimethylcyclopentane
B) (1R,2S) -1,2-dimethylcyclopentane
C) (1S,2R) -1,2-dimethylcyclopentane
D) (1S,2S) -1,2-dimethylcyclopentane

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

Correct Answer

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


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

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

Correct Answer

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How many stereogenic centers are present in gabapentin,used clinically to treat seizures and certain types of chronic pain? How many stereogenic centers are present in gabapentin,used clinically to treat seizures and certain types of chronic pain? A) 0 B) 1 C) 2 D) 3


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

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

Correct Answer

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Which of the following compounds has a plane of symmetry? Which of the following compounds has a plane of symmetry? A) I and II B) II and III C) II,III,and IV D) III and IV


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

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

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

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

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) 1 B) 2 C) 3 D) 4


A) 1
B) 2
C) 3
D) 4

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

Correct Answer

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Which of the following compounds are chiral? Which of the following compounds are chiral? A) I and II B) II and III C) III and IV D) I and IV


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

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

Correct Answer

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