OChem Chapter 5 homework
C
Assign the following stereocenter as having the R or S absolute configuration. A: R B: S C: There are no stereocenter in this compound
C
When a racemic mixture is reacted with a single enantiomer of another compound, then a pair of _________ is formed. A: Identical compounds B: Enantiomers C: Diastereomers D: None of the above
D
Drawn below is the structure of Crestor® (rosuvastatin), a medication used to reduce cholesterol. Assign the absolute configurations of the two chiral centers as R or S. A: Both centers are R. B: Left center is R, right center is S. C: Both centers are S. D: Left center is S, right center is R.
7
How many stereoisomers of the following compound are possible? 5 2 7 10
B
Identify the relationship between these two structures. A: Diastereomers B: Identical C: Unrelated compounds D: Enantiomers
C
Identify the relationship between these two structures. A: The same compounds B: Enantiomers C: Diastereomers D: Unrelated compounds
R
If a sample of carvone gives an observed rotation of -60 and the specific rotation of (R)-carvone is -61, does the unknown sample primarily have the R or S absolute configuration? S R None
D
In chiral column chromatography, __________ adsorbent is used to separate a pair of enantiomers. A: a nonpolar B: an achiral C: a polar D: a chiral
E
Is the alkene on the left in the molecule below E, Z, or neither?
Trans
Is the alkene on the left in the molecule below cis, trans, or neither?
No
Is the following a meso compound?
None
Select a diastereomer of the following compound.
B
Select the Fischer projection of the following compound.
B
Select the enantiomer of the following compound.
C
Select the enantiomer of the following compound.
D
Select the enantiomer of the following compound.
I
Select the wedge/dash drawing of the following Fischer projection.
Trans
Shown below is the structure of Crestor® (rosuvastatin), a medication used to reduce cholesterol. Is the highlighted alkene of rosuvastatin cis, trans, or neither?
Trans
Shown below is the structure of Singulair® (montelukast), a medication used to manage asthma. Is the alkene of montelukast cis, trans, or neither?
E
Shown below is the structure of Singulair® (montelukast), a medication used to manage athsma. Is the alkene of montelukast E, Z, or neither?
A
The structure of Crestor (rosuvastatin), a medication used to reduce cholesterol, is shown below. If the specific rotation for this compound is known to be +100, what would be the specific rotation for the stereoisomer shown at the right? A: Impossible to predict B: +100 C: -100 D: 0
D
What is the %_ee of a sample of carvone that exhibits an observed rotation of -20, given that the specific rotation of (R)-carvone is -61? A: 10 B: 15 C: 66 D: 33
C
What is the absolute configuration of compound below? A: 1R,2R B: 1S,2S C: 1S,2R D: 1R,2S
D
What is the percentage of the R enantiomer in a sample of carvone that has an observed rotation of 30, given that the specific rotation of (R)-carvone is -61? Entry field with correct answer A: 51% B: 49% C: 74.5% D: 25.5%
D
What is the relationship between the following two molecules? A: Diastereomers B: Enantiomers C: Constitutional isomers D: Identical
C
What is the relationship between the following two molecules? A: Identical B: Constitutional isomers C: Enantiomers D: Diastereomers
A
What is the relationship between the two structures shown? A: Enantiomers B: Diastereomers C: Same compound D: None of these
61
What is the specific rotation of pure (S)-carvone if a sample of (R)-carvone of 85% ee has a specific rotation of −52? 61 -61 64 0
B
When a toluene solution of the sugar-derived compound below is cooled, the molecules self-assemble into fibrous aggregates which work in concert with the surface tension of the solvent to form a stable gel. Select the structure showing both nonaromatic rings in chair conformations with the bridgehead hydrogen atoms in axial positions. Be sure to conserve the correct absolute stereochemistry in your answer.
II
Which of the following structures is the correct wedge/dash drawing of the following Fischer projection?
