Question 1

Can one predict whether a compound with a single asymmetric carbon is dextro- or levorotatory based on the R/S assignment at this asymmetric carbon? Explain briefly.

Accepted Answer

No. R/S assignment is purely a...

Question 2

Why is the following structure not a meso compound?

Accepted Answer

The functional group at the to...

Question 3

Which of the following statements is (are)  true for the compound cis-1,2-dichlorocyclopropane?

Accepted Answer

A)   This compound is chiral.
B)   The enantiomer of this compound is trans-1,2-dichlorocyclopropane.
C)   This compound contains no asymmetric carbons.
D)   all of the above
E)   none of the aboveF) B) and D)
G) A) and C)

Question 4

What is the structural relationship between the two molecule shown below?

Accepted Answer

A)   constitutional isomers
B)   enantiomers
C)   diastereomers
D)   conformational isomers
E)   not isomersF) D) and E)
G) B) and E)

Question 5

Can a molecule be chiral if it contains no asymmetric carbons? Explain briefly.

Accepted Answer

Yes. The presence of asymmetric carbons ...

Question 6

Draw the Fischer projection of (S)-2-bromobutane.

Accepted Answer

The answer of Draw the Fischer projection of (S)-2-bromobutane....

Question 7

Briefly describe how two enantiomers might be separated.

Accepted Answer

The two compounds can be converted to di...

Question 8

Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane.

Accepted Answer

The answer of Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane....

Question 9

Does the molecule shown below contain asymmetric carbon atoms? Is this molecule chiral?

Accepted Answer

Yes, the molecule contains 4 a...

Question 10

How many diastereomers are there of the molecule shown below?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   6F) B) and C)
G) C) and D)

Question 11

How many asymmetric carbon atoms are present in the molecule shown?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) D) and E)
G) A) and D)

Question 12

Circle all structures shown below that are chiral.

Accepted Answer

The answer of Circle all structures shown below that are...

Question 13

Which of the following terms best describes the pair of compounds shown: $\underline{\text{  enantiomers, diastereomers }}$ , or $\underline{\text{ the same compound?  }}$

Accepted Answer

The answer of Which of the following terms best describes...

Question 14

Is the molecule shown below chiral or achiral?
CH3CH2CH(CH3)CH2CH3

Accepted Answer

Question 15

Draw the structure of (S)-3-chloro-3-methylhexane. Take particular care to indicate stereochemistry properly.

Accepted Answer

The answer of Draw the structure of (S)-3-chloro-3-methylhexane. Take particular...

Question 16

How many asymmetric carbon atoms are present in the molecule shown?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) A) and B)
G) D) and E)

Question 17

How many asymmetric carbons are present in the compound below?
3-ethyl-2,2,4-trimethylpentane

Accepted Answer

The answer of How many asymmetric carbons are present in...

Question 18

A mixture of two enantiomers with a composition of 65.0% R has an observed rotation of -25.3° in a 25D of an optically pure sample of the S enantiomer? A)  -25.3° B)  -53.5° C)  +12.4° D)  +41.3° E)  +53.5°" class="answers-bank-image d-inline" rel="preload" > polarimeter tube. If the mixture has a concentration of 2.038 g/mL at 25°C, what is the predicted [α]25D of an optically pure sample of the S enantiomer?

Accepted Answer

A)   -25.3°
B)   -53.5°
C)   +12.4°
D)   +41.3°
E)   +53.5°F) C) and E)
G) A) and B)

Question 19

Which of the following terms best describes the pair of compounds shown: $\underline{\text{ enantiomers, diastereomers, }}$ or $\underline{\text{ the same compound?  }}$

Accepted Answer

The answer of Which of the following terms best describes...

Question 20

Is the mirror image of the following molecule an enantiomer or is it superimposable with it?

Accepted Answer

Superimpos...

Exam 5: Stereochemistry

Can one predict whether a compound with a single asymmetric carbon is dextro- or levorotatory based on the R/S assignment at this asymmetric carbon? Explain briefly.

Correct Answer
verified
No. R/S assignment is purely a...
View Answer

How many diastereomers are there of the molecule shown below?

Correct Answer
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Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane.

Correct Answer
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Is the mirror image of the following molecule an enantiomer or is it superimposable with it?

Correct Answer
verified
Superimpos...
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How many asymmetric carbon atoms are present in the molecule shown?

Correct Answer
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Can a molecule be chiral if it contains no asymmetric carbons? Explain briefly.

Correct Answer
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Yes. The presence of asymmetric carbons ...
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Which of the following statements is (are) true for the compound cis-1,2-dichlorocyclopropane?

Correct Answer
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Correct Answer
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Draw the Fischer projection of (S)-2-bromobutane.

Correct Answer
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Does the molecule shown below contain asymmetric carbon atoms? Is this molecule chiral?

Correct Answer
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Yes, the molecule contains 4 a...
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Why is the following structure not a meso compound?

Correct Answer
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The functional group at the to...
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Draw the structure of (S)-3-chloro-3-methylhexane. Take particular care to indicate stereochemistry properly.

Correct Answer
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How many asymmetric carbon atoms are present in the molecule shown?

Correct Answer
verified

A mixture of two enantiomers with a composition of 65.0% R has an observed rotation of -25.3° in a polarimeter tube. If the mixture has a concentration of 2.038 g/mL at 25°C, what is the predicted [α]²⁵D of an optically pure sample of the S enantiomer?

Correct Answer
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How many asymmetric carbons are present in the compound below? 3-ethyl-2,2,4-trimethylpentane

Correct Answer
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What is the structural relationship between the two molecule shown below?

Correct Answer
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Correct Answer
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Circle all structures shown below that are chiral.

Correct Answer
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Is the molecule shown below chiral or achiral? CH₃CH₂CH(CH₃)CH₂CH₃

Correct Answer
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Briefly describe how two enantiomers might be separated.

Correct Answer
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The two compounds can be converted to di...
View Answer

Exam 5: Stereochemistry

Can one predict whether a compound with a single asymmetric carbon is dextro- or levorotatory based on the R/S assignment at this asymmetric carbon? Explain briefly.

Correct AnswerverifiedNo. R/S assignment is purely a...View AnswerShow Answer

How many diastereomers are there of the molecule shown below?

Correct AnswerverifiedShow Answer

Provide a Fischer projection of (2R,3R,4S)-2,3,4-trichloroheptane.

Correct AnswerverifiedShow Answer

Is the mirror image of the following molecule an enantiomer or is it superimposable with it?

Correct AnswerverifiedSuperimpos...View AnswerShow Answer

How many asymmetric carbon atoms are present in the molecule shown?

Correct AnswerverifiedShow Answer

Can a molecule be chiral if it contains no asymmetric carbons? Explain briefly.

Correct AnswerverifiedYes. The presence of asymmetric carbons ...View AnswerShow Answer

Which of the following statements is (are) true for the compound cis-1,2-dichlorocyclopropane?

Correct AnswerverifiedShow Answer

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, ‾\underline{\text{ enantiomers, diastereomers, }} enantiomers, diastereomers, ​ or the same compound? ‾\underline{\text{ the same compound? }} the same compound? ​

Correct AnswerverifiedShow Answer

Draw the Fischer projection of (S)-2-bromobutane.

Correct AnswerverifiedShow Answer

Does the molecule shown below contain asymmetric carbon atoms? Is this molecule chiral?

Correct AnswerverifiedYes, the molecule contains 4 a...View AnswerShow Answer

Why is the following structure not a meso compound?

Correct AnswerverifiedThe functional group at the to...View AnswerShow Answer

Draw the structure of (S)-3-chloro-3-methylhexane. Take particular care to indicate stereochemistry properly.

Correct AnswerverifiedShow Answer

How many asymmetric carbon atoms are present in the molecule shown?

Correct AnswerverifiedShow Answer

A mixture of two enantiomers with a composition of 65.0% R has an observed rotation of -25.3° in a polarimeter tube. If the mixture has a concentration of 2.038 g/mL at 25°C, what is the predicted [α]25D of an optically pure sample of the S enantiomer?

Correct AnswerverifiedShow Answer

How many asymmetric carbons are present in the compound below? 3-ethyl-2,2,4-trimethylpentane

Correct AnswerverifiedShow Answer

What is the structural relationship between the two molecule shown below?

Correct AnswerverifiedShow Answer

Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers ‾\underline{\text{ enantiomers, diastereomers }} enantiomers, diastereomers ​ , or the same compound? ‾\underline{\text{ the same compound? }} the same compound? ​

Correct AnswerverifiedShow Answer

Circle all structures shown below that are chiral.

Correct AnswerverifiedShow Answer

Is the molecule shown below chiral or achiral? CH3CH2CH(CH3)CH2CH3

Correct AnswerverifiedShow Answer

Briefly describe how two enantiomers might be separated.

Correct AnswerverifiedThe two compounds can be converted to di...View AnswerShow Answer

Correct Answer
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No. R/S assignment is purely a...
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Correct Answer
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Correct Answer
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Correct Answer
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Superimpos...
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Correct Answer
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Correct Answer
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Yes. The presence of asymmetric carbons ...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Yes, the molecule contains 4 a...
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Correct Answer
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The functional group at the to...
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Correct Answer
verified

Correct Answer
verified

A mixture of two enantiomers with a composition of 65.0% R has an observed rotation of -25.3° in a polarimeter tube. If the mixture has a concentration of 2.038 g/mL at 25°C, what is the predicted [α]²⁵D of an optically pure sample of the S enantiomer?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Is the molecule shown below chiral or achiral? CH₃CH₂CH(CH₃)CH₂CH₃

Correct Answer
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Correct Answer
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The two compounds can be converted to di...
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