Question 1

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 2

How many stereoisomers does the following molecule contain?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) B) and D)
F) None of the above

Question 3

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)  atropisomersE) B) and C)
F) All of the above

Question 4

Which of the following molecules is achiral?

Accepted Answer

A)   
B)   
C)   
D)   E) None of the above
F) All of the above

Question 5

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.E) A) and B)
F) B) and D)

Question 6

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 achiralE) None of the above
F) B) and D)

Question 7

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 IVE) A) and C)
F) All of the above

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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.E) A) and C)
F) B) and C)

Question 11

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

Accepted Answer

A)  identical molecules
B)  enantiomers
C)  diastereomers
D)  constitutional isomersE) B) and C)
F) B) and D)

Question 12

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 13

Enantiomers have _______________ physical properties.

Accepted Answer

identical

Question 14

Diastereomers have identical physical properties.

Accepted Answer

A) True 
 B)False

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-eneE) A) and D)
F) None of the above

Question 16

Stereoisomers are a type of constitutional isomer.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A) True 
 B)False  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 isomersE) B) and C)
F) C) and D)

Question 19

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 IIIE) A) and B)
F) A) and C)

Question 20

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...

Exam 4: Stereochemistry

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.

How many stereoisomers does the following molecule contain?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following molecules is achiral?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What best describes the molecule 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

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

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

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

Correct AnswerverifiedShow Answer

Enantiomers have _______________ physical properties.

Correct Answerverifiedidentical

Diastereomers have identical physical properties.

Correct AnswerverifiedShow Answer

What is the correct IUPAC name for the following compound?

Correct AnswerverifiedShow Answer

Stereoisomers are a type of constitutional isomer.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

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

Correct AnswerverifiedShow Answer

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

Correct Answer
verified
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.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
identical

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
False

Correct Answer
verified

Correct Answer
verified

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