Question 1

does not undergo the Diels-Alder reaction as a diene because:

Accepted Answer

A)  a bicyclic ring system cannot function as the diene component.
B)  it cannot adopt the s-cis conformation.
C)  it lacks electron-withdrawing groups.
D)  it lacks strong electron-releasing groups.
E)  the two double bonds are further apart than in a non-cyclic conjugated system.

Question 2

Which carbon-carbon bond in the following compound would you expect to be shortest?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  V

Question 3

Select the structure of the conjugated diene.

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  V

Question 4

1,3-Pentadiene has how many antibonding  π\piπ  molecular orbitals?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  0

Question 5

Arrange these hexadienes in order of expected decreasing stability.  II > I > III > IV B) III > IV > II > I > V C) IV > III > II > V > I D) IV > III > I > II > V E) I > II > IV > III > V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  V > II > I > III > IV
B)  III > IV > II > I > V
C)  IV > III > II > V > I
D)  IV > III > I > II > V
E)  I > II > IV > III > V

Question 6

Which of the following can undergo the Diels Alder reaction?

Accepted Answer

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

Question 7

Which is the major product of the following reaction?

Accepted Answer

A)  I + enantiomer
B)  II
C)  III + enantiomer
D)  IV
E)  None of these choices.

Question 8

Which of these conjugated dienes can undergo a Diels-Alder reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  All of these choices.

Question 9

Which reaction would produce the following compound?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  None of these choices.

Question 10

does not undergo the Diels-Alder reaction because:

Accepted Answer

A)  ring systems cannot function as the diene component.
B)  it cannot adopt the s-cis conformation.
C)  it lacks electron-withdrawing groups.
D)  it lacks strong electron-releasing groups.
E)  the two double bonds are farther apart than in a non-cyclic conjugated system.

Question 11

Conjugated dienes routinely undergo 1,2 and 1,4 addition reactions with a variety of electrophilic reagents; this suggests that ___ are likely intermediates during these reactions.

Accepted Answer

allylic ca...

Question 12

Which reaction would produce the following compound?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  None of these choices.

Question 13

What is an IUPAC name for

Accepted Answer

A)  2,3-methylhept-2-en-4-yne
B)  1,1,3-trimethylhex-3-yn-1-ene
C)  1,1,3-trimethyl-3-hexyn-1-ene
D)  2,3-dimethyl-2-hepten-4-yne
E)  5,6-dimethyl-5-hepten-3-yne

Question 14

From the standpoint of reactivity,which is the poorest choice of dienophile to react with 2,3-dimethyl-1,3-butadiene in a Diels-Alder reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  V

Question 15

does not undergo the Diels-Alder reaction as a diene because:

Accepted Answer

A)  a bicyclic ring system cannot function as the diene component.
B)  it cannot adopt the s-cis conformation.
C)  it lacks electron-withdrawing groups.
D)  it lacks strong electron-releasing groups.
E)  the two double bonds are farther apart than in a non-cyclic conjugated system.

Question 16

The allyl radical has how many bonding  π\piπ  molecular orbitals?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5

Question 17

Stereochemically speaking,the Diels-Alder reaction is ___ and occurs with ___ of the dienophile stereochemistry.

Accepted Answer

stereospec...

Question 18

Which of the following dienes would you expect to be the most stable?

Accepted Answer

A)  CH3CH2CH=CHCH2CH=CHCH3
B)  CH3CH=CHCH=CHCH2CH3
C)  CH2=CHCH2CH2CH2CH=CH2
D)  CH2=CHCH=CHCH2CH2CH3
E)  CH3CH=C(CH3) CH=CHCH2CH3

Question 19

Which is the major product of the following reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  V

Question 20

Select the structure(s) in which the multiple bonds are conjugated.

Accepted Answer

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

Exam 13: Conjugated Unsaturated Systems

Which carbon-carbon bond in the following compound would you expect to be shortest?

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Arrange these hexadienes in order of expected decreasing stability.

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Which of the following dienes would you expect to be the most stable?

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From the standpoint of reactivity,which is the poorest choice of dienophile to react with 2,3-dimethyl-1,3-butadiene in a Diels-Alder reaction?

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Select the structure of the conjugated diene.

Correct AnswerverifiedShow Answer

What is an IUPAC name for

Correct AnswerverifiedShow Answer

does not undergo the Diels-Alder reaction as a diene because:

Correct AnswerverifiedShow Answer

Conjugated dienes routinely undergo 1,2 and 1,4 addition reactions with a variety of electrophilic reagents; this suggests that ___ are likely intermediates during these reactions.

Correct Answerverifiedallylic ca...View AnswerShow Answer

The allyl radical has how many bonding π\piπ molecular orbitals?

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does not undergo the Diels-Alder reaction because:

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does not undergo the Diels-Alder reaction as a diene because:

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Select the structure(s) in which the multiple bonds are conjugated.

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Which of the following can undergo the Diels Alder reaction?

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Stereochemically speaking,the Diels-Alder reaction is ___ and occurs with ___ of the dienophile stereochemistry.

Correct Answerverifiedstereospec...View AnswerShow Answer

Which reaction would produce the following compound?

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1,3-Pentadiene has how many antibonding π\piπ molecular orbitals?

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Which is the major product of the following reaction?

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Which reaction would produce the following compound?

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Which of these conjugated dienes can undergo a Diels-Alder reaction?

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Which is the major product of the following reaction?

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allylic ca...
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The allyl radical has how many bonding $\pi$ molecular orbitals?

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Stereochemically speaking,the Diels-Alder reaction is _ and occurs with _ of the dienophile stereochemistry.

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stereospec...
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1,3-Pentadiene has how many antibonding $\pi$ molecular orbitals?

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