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Deck 4: Isomers the Arrangement of Atoms in Space
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Question
How many asymmetric carbon centers are found in cabergoline, a drug used to treat Parkinson's disease?
A) 1
B) 2
C) 3
D) 4
E) 5
A) 1
B) 2
C) 3
D) 4
E) 5
Question
Which of the following structures is an E isomer?
A) 1
B) 2
C) 3
D) 1 and 2
E) 1 and 3
A) 1
B) 2
C) 3
D) 1 and 2
E) 1 and 3
Question
A sample of the disulfide L-cystine has an observed specific rotation of -14. Pure L-cystine has a specific rotation of -70. What percent of each enantiomer is present in the sample?
A) 14 (?) and 56 (+)
B) 20 (?) and 80 (+)
C) 60 (?) and 40 (+)
D) 80 (?) and 20 (+)
E) 84 (?) and 16 (+)
A) 14 (?) and 56 (+)
B) 20 (?) and 80 (+)
C) 60 (?) and 40 (+)
D) 80 (?) and 20 (+)
E) 84 (?) and 16 (+)
Question
Which structure(s) is(are) an enantiomer of the molecule at the top left?
A)
B)
C)
D)
A)
B)
C)
D)
Question
Which of the following structures has the S configuration?
A) 1
B) 2
C) 3
D) 4
E) 1 and 3
A) 1
B) 2
C) 3
D) 4
E) 1 and 3
Question
What is the relationship between the two compounds shown below? 
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
Question
Which of the following structures has the S,S configuration?
A) 1
B) 2
C) 3
D) 1 and 3
E) none of the above
Structures 1 and 3 are meso and must have R and S asymmetric centers. Structure 2 has no plane of symmetry.
A) 1
B) 2
C) 3
D) 1 and 3
E) none of the above
Structures 1 and 3 are meso and must have R and S asymmetric centers. Structure 2 has no plane of symmetry.
Question
What is the maximum number of stereoisomers possible for nootkatone (grapefruit oil) shown below?
A) 2
B) 3
C) 4
D) 8
E) 16
A) 2
B) 3
C) 4
D) 8
E) 16
Question
Which of the following structures is a meso compound?
A) 1
B) 2
C) 3
D) 4
E) 2 and 4
A) 1
B) 2
C) 3
D) 4
E) 2 and 4
Question
What is the relationship between the two compounds shown below?
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
Question
Using Cahn-Ingold-Prelog rules, which set of answers is correctly organized from highest to lowest priority?
A) ?CH2NH2 > ?CN > -COOH > ?NH2
B) ?COOH > ?CN > ?CH2NH2 > ?NH2
C) ?NH2 > ?CN > ?CH2NH2 > ?COOH
D) ?NH2 > ?COOH > ?CN > ?CH2NH2
E) ?CN > ?NH2 > ?CH2NH2 > ?COOH
Relative priorities are based on atomic number and the rules for multiple bonds (?C
N is greater than ?CH2NH2).
A) ?CH2NH2 > ?CN > -COOH > ?NH2
B) ?COOH > ?CN > ?CH2NH2 > ?NH2
C) ?NH2 > ?CN > ?CH2NH2 > ?COOH
D) ?NH2 > ?COOH > ?CN > ?CH2NH2
E) ?CN > ?NH2 > ?CH2NH2 > ?COOH
Relative priorities are based on atomic number and the rules for multiple bonds (?C
N is greater than ?CH2NH2).
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Deck 4: Isomers the Arrangement of Atoms in Space
1
How many asymmetric carbon centers are found in cabergoline, a drug used to treat Parkinson's disease?
A) 1
B) 2
C) 3
D) 4
E) 5
A) 1
B) 2
C) 3
D) 4
E) 5
3
2
Which of the following structures is an E isomer?
A) 1
B) 2
C) 3
D) 1 and 2
E) 1 and 3
A) 1
B) 2
C) 3
D) 1 and 2
E) 1 and 3
1 and 2
3
A sample of the disulfide L-cystine has an observed specific rotation of -14. Pure L-cystine has a specific rotation of -70. What percent of each enantiomer is present in the sample?
A) 14 (?) and 56 (+)
B) 20 (?) and 80 (+)
C) 60 (?) and 40 (+)
D) 80 (?) and 20 (+)
E) 84 (?) and 16 (+)
A) 14 (?) and 56 (+)
B) 20 (?) and 80 (+)
C) 60 (?) and 40 (+)
D) 80 (?) and 20 (+)
E) 84 (?) and 16 (+)
60 (?) and 40 (+)
4
Which structure(s) is(are) an enantiomer of the molecule at the top left?
A)
B)
C)
D)
A)
B)
C)
D)
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5
Which of the following structures has the S configuration?
A) 1
B) 2
C) 3
D) 4
E) 1 and 3
A) 1
B) 2
C) 3
D) 4
E) 1 and 3
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6
What is the relationship between the two compounds shown below?
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
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7
Which of the following structures has the S,S configuration?
A) 1
B) 2
C) 3
D) 1 and 3
E) none of the above
Structures 1 and 3 are meso and must have R and S asymmetric centers. Structure 2 has no plane of symmetry.
A) 1
B) 2
C) 3
D) 1 and 3
E) none of the above
Structures 1 and 3 are meso and must have R and S asymmetric centers. Structure 2 has no plane of symmetry.
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8
What is the maximum number of stereoisomers possible for nootkatone (grapefruit oil) shown below?
A) 2
B) 3
C) 4
D) 8
E) 16
A) 2
B) 3
C) 4
D) 8
E) 16
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9
Which of the following structures is a meso compound?
A) 1
B) 2
C) 3
D) 4
E) 2 and 4
A) 1
B) 2
C) 3
D) 4
E) 2 and 4
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10
What is the relationship between the two compounds shown below?
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
A) enantiomers
B) diastereomers
C) constitutional isomers
D) geometric isomers
E) identical compounds
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Unlock for access to all 11 flashcards in this deck.
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11
Using Cahn-Ingold-Prelog rules, which set of answers is correctly organized from highest to lowest priority?
A) ?CH2NH2 > ?CN > -COOH > ?NH2
B) ?COOH > ?CN > ?CH2NH2 > ?NH2
C) ?NH2 > ?CN > ?CH2NH2 > ?COOH
D) ?NH2 > ?COOH > ?CN > ?CH2NH2
E) ?CN > ?NH2 > ?CH2NH2 > ?COOH
Relative priorities are based on atomic number and the rules for multiple bonds (?C N is greater than ?CH2NH2).
A) ?CH2NH2 > ?CN > -COOH > ?NH2
B) ?COOH > ?CN > ?CH2NH2 > ?NH2
C) ?NH2 > ?CN > ?CH2NH2 > ?COOH
D) ?NH2 > ?COOH > ?CN > ?CH2NH2
E) ?CN > ?NH2 > ?CH2NH2 > ?COOH
Relative priorities are based on atomic number and the rules for multiple bonds (?C
N is greater than ?CH2NH2). Unlock Deck
Unlock for access to all 11 flashcards in this deck.
Unlock Deck
k this deck
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Unlock for access to all 11 flashcards in this deck.
