Question 1

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 C)
F) A) and D)

Question 2

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

Accepted Answer

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

Question 3

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) All of the above
F) None of the above

Question 4

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) B) and D)
F) A) and B)

Question 5

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 6

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

Accepted Answer

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

Question 7

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 B)
F) All of the above

Question 8

What is the major organic product of the following reaction?

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

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

Question 11

What is the major organic product of the following reaction?

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

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) A) and D)
F) A) and C)

Question 15

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

Question 16

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) C) and D)
F) A) and D)

Question 17

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) A) and B)
F) None of the above

Question 18

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 C)
F) All of the above

Question 19

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) All of the above
F) None of the above

Question 20

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) B) and C)
F) A) and D)

Exam 16: Conjugation, Resonance, and Dienes

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

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

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

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

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What is the definition of a resonance structure?

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Which of the following is the most reactive diene in a Diels-Alder 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 diene and dienophile are used in a Diels-Alder reaction to prepare the following compound?

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

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What is the major organic product of the following reaction?

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What is the major organic product of the following reaction?

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

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

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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 is the major organic product of the following reaction?

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