Question 1

A newly isolated natural product was shown to be optically active.If a solution of 2.0 g in 10 mL of ethanol in a 50 cm tube gives a rotation of +2.57°,what is the specific rotation of this natural product?

Accepted Answer

+2.57°

Question 2

Which of the statements below correctly describes an achiral molecule?

Accepted Answer

A)  The molecule has a nonsuperimposable mirror image.
B)  The molecule exhibits optical activity when it interacts with plane-polarized light.
C)  The molecule has an enantiomer.
D)  The molecule might be a meso form.
E)  none of the aboveF) B) and C)
G) All of the above

Question 3

Structure of pseudoephedrine,a nasal decongestant is shown below.Draw a diastereomer.

Accepted Answer

The answer of Structure of pseudoephedrine,a nasal decongestant is shown...

Question 4

What type of isomers are CH3CH2OCH3 and CH3CH2CH2OH?

Accepted Answer

A)  constitutional
B)  symmetrical
C)  configurational
D)  conformational
E)  stereochemicalF) A) and B)
G) A) and C) A

Question 5

What is the relationship between the structures shown below?

Accepted Answer

A)  not isomers
B)  constitutional isomers
C)  conformational isomers
D)  configurational isomers
E)  enantiomersF) A) and E)
G) A) and B)

Question 6

How many asymmetric centers are present in a molecule of 2,4,6-trimethylheptane?

Accepted Answer

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

Question 7

Is the molecule shown chiral? Is it a meso compound?

Accepted Answer

not chiral...

Question 8

Label the molecule shown as chiral or achiral.

Accepted Answer

The answer of Label the molecule shown as chiral or...

Question 9

Is the molecule shown chiral? Is it a meso compound?

Accepted Answer

not chiral...

Question 10

Give the complete name(s)of the following compound.

Accepted Answer

(2R,4S)-2,4-dichloro...

Question 11

Draw the structure of (S)-1-bromo-1-chloropropane.Take particular care to indicate three-dimensional stereochemistry detail properly.

Accepted Answer

The answer of Draw the structure of (S)-1-bromo-1-chloropropane.Take particular care...

Question 12

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Accepted Answer

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

Question 13

How many asymmetric centers are present in the compound shown below?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) A) and B)
G) A) and C) C

Question 14

What is the relationship between the following compounds?

Accepted Answer

A)  configurational isomers
B)  conformational isomers
C)  constitutional isomers
D)  structural isomers
E)  positional isomersF) A) and E)
G) None of the above

Question 15

Which of the following compounds has an R configuration?

Accepted Answer

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

Question 16

Twenty grams of a compound was dissolved in 100 mL of solvent and gave an observed rotation of -20 degrees.The sample tube is 4 dm long.Calculate the specific rotation.

Accepted Answer

The answer of Twenty grams of a compound was dissolved...

Question 17

Label each asymmetrical carbon in the compound below as R or S.

Accepted Answer

The answer of Label each asymmetrical carbon in the compound...

Question 18

Is the molecule shown below chiral or achiral?

Accepted Answer

The answer of Is the molecule shown below chiral or...

Question 19

The compound CH3CHClCH2CH=CHCH2CH3 contains only one asymmetric center.Explain why it has four stereoisomers.

Accepted Answer

In addition to the single asymmetric cen...

Question 20

Which of the following groups has the highest priority using the Cahn,Ingold,Prelog rules?

Accepted Answer

A)   3 
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   3 
E)    " class="answers-bank-image d-inline" rel="preload" >
C)  -OH
D)  -O-CH3
E)   3 
E)    " class="answers-bank-image d-inline" rel="preload" >F) A) and E)
G) B) and C)

Exam 4: Isomers: the Arrangement of Atoms in Space

A newly isolated natural product was shown to be optically active.If a solution of 2.0 g in 10 mL of ethanol in a 50 cm tube gives a rotation of +2.57°,what is the specific rotation of this natural product?

Correct Answerverified+2.57°

Which of the statements below correctly describes an achiral molecule?

Correct AnswerverifiedShow Answer

Structure of pseudoephedrine,a nasal decongestant is shown below.Draw a diastereomer.

Correct AnswerverifiedShow Answer

What type of isomers are CH3CH2OCH3 and CH3CH2CH2OH?

Correct AnswerverifiedA

What is the relationship between the structures shown below?

Correct AnswerverifiedShow Answer

How many asymmetric centers are present in a molecule of 2,4,6-trimethylheptane?

Correct AnswerverifiedShow Answer

Is the molecule shown chiral? Is it a meso compound?

Correct Answerverifiednot chiral...View AnswerShow Answer

Label the molecule shown as chiral or achiral.

Correct AnswerverifiedShow Answer

Is the molecule shown chiral? Is it a meso compound?

Correct Answerverifiednot chiral...View AnswerShow Answer

Give the complete name(s)of the following compound.

Correct Answerverified(2R,4S)-2,4-dichloro...View AnswerShow Answer

Draw the structure of (S)-1-bromo-1-chloropropane.Take particular care to indicate three-dimensional stereochemistry detail properly.

Correct AnswerverifiedShow Answer

Which of the following terms best describes the pair of compounds shown: enantiomers,diastereomers,or the same compound?

Correct AnswerverifiedShow Answer

How many asymmetric centers are present in the compound shown below?

Correct AnswerverifiedC

What is the relationship between the following compounds?

Correct AnswerverifiedShow Answer

Which of the following compounds has an R configuration?

Correct AnswerverifiedShow Answer

Twenty grams of a compound was dissolved in 100 mL of solvent and gave an observed rotation of -20 degrees.The sample tube is 4 dm long.Calculate the specific rotation.

Correct AnswerverifiedShow Answer

Label each asymmetrical carbon in the compound below as R or S.

Correct AnswerverifiedShow Answer

Is the molecule shown below chiral or achiral?

Correct AnswerverifiedShow Answer

The compound CH3CHClCH2CH=CHCH2CH3 contains only one asymmetric center.Explain why it has four stereoisomers.

Correct AnswerverifiedIn addition to the single asymmetric cen...View AnswerShow Answer

Which of the following groups has the highest priority using the Cahn,Ingold,Prelog rules?

Correct AnswerverifiedShow Answer

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+2.57°

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What type of isomers are CH₃CH₂OCH₃ and CH₃CH₂CH₂OH?

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A

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not chiral...
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not chiral...
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(2R,4S)-2,4-dichloro...
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C

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The compound CH₃CHClCH₂CH=CHCH₂CH₃ contains only one asymmetric center.Explain why it has four stereoisomers.

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In addition to the single asymmetric cen...
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