Question 1

Which of the following is the most reactive diene in a Diels-Alder reaction?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) B) and C)
F) C) and D)

Question 2

What is the major organic product of the following reaction?

Accepted Answer

A)   Only I
B)   Only II
C)   Only III
D)   Only I and IIE) A) and D)
F) A) and B)

Question 3

Which of the following is not a feature of the Diels-Alder reaction?

Accepted Answer

A)   They are initiated by peroxides.
B)   They form new six-membered rings.
C)   Three pi bonds break.
D)   They are concerted.E) A) and B)
F) A) and D)

Question 4

What is the reactive intermediate in the reaction of 1,3-diene with HBr, resulting in 1,4-addition?

Accepted Answer

A)   Allylic radical
B)   Cyclic bromonium ion
C)   Dienophile
D)   Allylic carbocationE) None of the above
F) All of the above

Question 5

What is the kinetic product obtained from the addition of 1 equivalent of HBr to 1,3-butadiene?

Accepted Answer

A)   3-Bromo-1-butene
B)   1-Bromo-2-butene
C)   2-Bromo-2-butene
D)   2-Bromo-1-buteneE) All of the above
F) A) and B)

Question 6

Which of the following dienes contain conjugated double bonds?

Accepted Answer

A)   Only I and II
B)   Only II and III
C)   Only I and III
D)   Only II and IVE) C) and D)
F) A) and D)

Question 7

What is the major organic product of the following reaction?

Accepted Answer

A)   Only I
B)   Only I and II
C)   Only II and III
D)   I, II, IIIE) None of the above
F) A) and C)

Question 8

What diene and dienophile are used in a Diels-Alder reaction to prepare the following compound?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) B) and C)
F) A) and D)

Question 9

What is the major organic product of the following reaction?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) A) and B)
F) A) and C)

Question 10

Which of the following compound absorbs UV light at the longest wavelength?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) A) and B)
F) A) and C)

Question 11

What is the major organic product of the following reaction?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) None of the above
F) A) and C)

Question 12

What is the hybridization around the indicated carbon atom in the following anion? 3 B)  sp2 C)  sp D)  p" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   sp3
B)   sp2
C)   sp
D)   pE) C) and D)
F) A) and D)

Question 13

Rank the following anions from most to least stable, listing the most stable first.  II > III B)  III > II > I C)  I > III > II D)  III > I > II" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I > II > III
B)   III > II > I
C)   I > III > II
D)   III > I > IIE) B) and D)
F) All of the above

Question 14

Which of the following is not a product obtained from the addition of 1 equivalent of HBr to (E) -1,3-pentadiene?

Accepted Answer

A)   (
E)  -4-Bromo-2-pentene
B)   (
E)  -1-Bromo-2-pentene
C)   3-Bromo-1-pentene
D)   (
E)  -3-Bromo-2-penteneE) None of the above
F) All of the above

Question 15

Which of the following is the least reactive diene in a Diels-Alder reaction?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) A) and D)
F) A) and B)

Question 16

What is the definition of a resonance structure?

Accepted Answer

A)   Compounds with the same molecular formula
B)   Compounds with different carbon frameworks
C)   Structures that differ only in the placement of pi and nonbonding electrons
D)   Structures that differ only in the location of bondsE) B) and D)
F) A) and D)

Question 17

Which of the following compound absorbs UV light at the longest wavelength?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) A) and B)
F) None of the above

Question 18

What is (are)  the major product(s)  of the following reaction?

Accepted Answer

A)   Only I
B)   Only II
C)   Only I and II
D)   I, II, IIIE) None of the above
F) B) and C)

Question 19

Which of the following is an example of a bridged bicyclic system?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) A) and D)
F) All of the above

Question 20

What is the major organic product of the following reaction?

Accepted Answer

A)   I
B)   II
C)   III
D)   IVE) B) and D)
F) None of the above

Exam 16: Conjugation, Resonance, and Dienes

What is the major organic product of the following reaction?

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What is the kinetic product obtained from the addition of 1 equivalent of HBr to 1,3-butadiene?

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What is the major organic product of the following reaction?

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Which of the following is an example of a bridged bicyclic system?

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Which of the following dienes contain conjugated double bonds?

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What is the major organic product of the following reaction?

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Which of the following compound absorbs UV light at the longest wavelength?

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What diene and dienophile are used in a Diels-Alder reaction to prepare the following compound?

Correct AnswerverifiedShow Answer

Which of the following is the least reactive diene in a Diels-Alder reaction?

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What is the major organic product of the following reaction?

Correct AnswerverifiedShow Answer

What is the definition of a resonance structure?

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Which of the following is not a product obtained from the addition of 1 equivalent of HBr to (E) -1,3-pentadiene?

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What is the hybridization around the indicated carbon atom in the following anion?

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Which of the following compound absorbs UV light at the longest wavelength?

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What is (are) the major product(s) of the following reaction?

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What is the reactive intermediate in the reaction of 1,3-diene with HBr, resulting in 1,4-addition?

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What is the major organic product of the following reaction?

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Which of the following is not a feature of the Diels-Alder reaction?

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Rank the following anions from most to least stable, listing the most stable first.

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Which of the following is the most reactive diene in a Diels-Alder reaction?

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