Question 1

Which of the following statements best describes the molecule shown below?

Accepted Answer

A)  It rotates plane-polarized light clockwise and has an absolute configuration of R.
B)  It rotates plane-polarized light counter-clockwise and has an absolute configuration of R.
C)  It rotates plane-polarized light clockwise and has an absolute configuration of S.
D)  It rotates plane polarized light counter-clockwise and has an absolute configuration of S.

Question 2

What best describes the relationship between I and II shown below?

Accepted Answer

A)  identical molecules
B)  enantiomers
C)  diastereomers
D)  constitutional isomers

Question 3

In a Fischer projection,the horizontal bonds are assumed to go into the page.

Accepted Answer

A) True 
 B)False  False

Question 4

What can be said about L-Glyceraldehyde (shown below) ?

Accepted Answer

A)  It rotates plane-polarized light clockwise and has an absolute configuration of R.
B)  It rotates plane-polarized light counter-clockwise and has an absolute configuration of R.
C)  It rotates plane-polarized light clockwise and has an absolute configuration of S.
D)  It rotates plane-polarized light counter-clockwise and has an absolute configuration of S.

Question 5

Figure 1
Figure 1: Epoxides I,II,III,IV 
-Which of the following epoxides in Figure 1 is/are optically active?

Accepted Answer

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

Question 6

Diastereomers have identical physical properties.

Accepted Answer

A) True 
 B)False

Question 7

What term refers to two molecules that differ at some but not all chiral centres?

Accepted Answer

A)  enantiomers
B)  diastereomers
C)  constitutional isomers
D)  atropisomers

Question 8

A 50:50 sample of enantiomers is also known as a _______________ mixture.

Accepted Answer

The answer of A 50:50 sample of enantiomers is also...

Question 9

Stereoisomers are a type of constitutional isomer.

Accepted Answer

A) True 
 B)False

Question 10

Convert the chair structure I into a line structure,and determine its stereochemical relationship to II shown below.

Accepted Answer

Compound I can be redrawn as follows:  The molecules differ at all chiral centres.Therefore,I and II are enantiomers.

Question 11

Enantiomers have _______________ physical properties.

Accepted Answer

identical

Question 12

Figure 1
Figure 1: Epoxides I,II,III,IV 
-Which of the following compounds in Figure 1 is/are meso?

Accepted Answer

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

Question 13

Given that the specific rotation of D-glucose is +52.7º,what is the ratio of enantiomers in a solution that contains a mixture of D and L glucose and a specific rotation of -23.5º?

Accepted Answer

Optical purity = (-23.5/52.7)*100% = -44...

Question 14

How many stereoisomers does the following molecule contain?

Accepted Answer

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

Question 15

What is the correct IUPAC name for the following compound?

Accepted Answer

A)  (R,
E)  -4-bromo-3-methylpent-2-ene
B)  (S,
E)  -4-bromo-3-methylpent-2-ene
C)  (R,Z) -4-bromo-3-methylpent-2-ene
D)  (S,Z) -4-bromo-3-methylpent-2-ene

Question 16

Molecules that rotate plane-polarized light clockwise have an absolute configuration of R.

Accepted Answer

A) True 
 B)False

Question 17

Z stereochemistry represents the highest-priority groups being on the same side of an alkene.

Accepted Answer

A) True 
 B)False

Question 18

What best describes the relationship between I and II shown below?

Accepted Answer

A)  identical molecules
B)  enantiomers
C)  diastereomers
D)  constitutional isomers

Question 19

What best describes the molecule shown below?

Accepted Answer

A)  symmetrical and chiral
B)  non-symmetrical and chiral
C)  symmetrical and achiral
D)  non-symmetrical and achiral

Question 20

Which of the following molecules is achiral?

Accepted Answer

A)   
B)   
C)   
D)

Exam 4: Stereochemistry

Which of the following statements best describes the molecule shown below?

Correct AnswerverifiedShow Answer

What best describes the relationship between I and II shown below?

Correct AnswerverifiedShow Answer

In a Fischer projection,the horizontal bonds are assumed to go into the page.

Correct AnswerverifiedFalse

What can be said about L-Glyceraldehyde (shown below) ?

Correct AnswerverifiedShow Answer

Figure 1 Figure 1: Epoxides I,II,III,IV -Which of the following epoxides in Figure 1 is/are optically active?

Correct AnswerverifiedShow Answer

Diastereomers have identical physical properties.

Correct AnswerverifiedShow Answer

What term refers to two molecules that differ at some but not all chiral centres?

Correct AnswerverifiedShow Answer

A 50:50 sample of enantiomers is also known as a _______________ mixture.

Correct AnswerverifiedShow Answer

Stereoisomers are a type of constitutional isomer.

Correct AnswerverifiedShow Answer

Convert the chair structure I into a line structure,and determine its stereochemical relationship to II shown below.

Correct AnswerverifiedCompound I can be redrawn as follows: 11eac423_bf7c_5f57_a9af_55e3d1f3cf84_TB7652_00 The molecules differ at all chiral centres.Therefore,I and II are enantiomers.

Enantiomers have _______________ physical properties.

Correct Answerverifiedidentical

Figure 1 Figure 1: Epoxides I,II,III,IV -Which of the following compounds in Figure 1 is/are meso?

Correct AnswerverifiedShow Answer

Given that the specific rotation of D-glucose is +52.7º,what is the ratio of enantiomers in a solution that contains a mixture of D and L glucose and a specific rotation of -23.5º?

Correct AnswerverifiedOptical purity = (-23.5/52.7)*100% = -44...View AnswerShow Answer

How many stereoisomers does the following molecule contain?

Correct AnswerverifiedShow Answer

What is the correct IUPAC name for the following compound?

Correct AnswerverifiedShow Answer

Molecules that rotate plane-polarized light clockwise have an absolute configuration of R.

Correct AnswerverifiedShow Answer

Z stereochemistry represents the highest-priority groups being on the same side of an alkene.

Correct AnswerverifiedShow Answer

What best describes the relationship between I and II shown below?

Correct AnswerverifiedShow Answer

What best describes the molecule shown below?

Correct AnswerverifiedShow Answer

Which of the following molecules is achiral?

Correct AnswerverifiedShow Answer

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Compound I can be redrawn as follows: 11eac423_bf7c_5f57_a9af_55e3d1f3cf84_TB7652_00 The molecules differ at all chiral centres.Therefore,I and II are enantiomers.

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identical

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Optical purity = (-23.5/52.7)*100% = -44...
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