Question 1

Explain briefly why cyclopentadiene readily reacts with strong bases.

Accepted Answer

The acidity of a substance can be often ...

Question 2

Draw all significant resonance structures for the cyclopentadienyl anion.

Accepted Answer

The answer of Draw all significant resonance structures for the...

Question 3

In the molecular orbital model of benzene,the six p-orbitals combine to form how many molecular orbitals?

Accepted Answer

A)   6
B)   5
C)   4
D)   3
E)   2F) A) and D)
G) A) and C)

Question 4

Which of the following would you expect to be antiaromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) B) and D)
G) A) and B)

Question 5

Which of these species is aromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) A) and D)
G) B) and C)

Question 6

Which reagent(s) /technique would serve to distinguish between azulene and bicyclo[5.3.0]decane? 2,CCl4 B)  KMnO4,OH - ,H2O C)  NMR Spectroscopy D)  NaBH4,H2O E)  Two of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Br2,CCl4
B)   KMnO4,OH - ,H2O
C)   NMR Spectroscopy
D)   NaBH4,H2O
E)   Two of theseF) A) and D)
G) B) and E)

Question 7

How many resonances would be expected in the broad-band decoupled C-13 spectra of:

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) None of the above
G) C) and E)

Question 8

Which of the following statements about cyclooctatetraene is NOT true?

Accepted Answer

A)   The compound rapidly decolorizes Br2/CCl4 solutions.
B)   The compound rapidly decolorizes aqueous solutions of KMnO4.
C)   The compound readily adds hydrogen.
D)   The compound is nonplanar.
E)   The compound is comparable to benzene in stability.F) All of the above
G) C) and E)

Question 9

Cyclopentadiene is unusually acidic for a hydrocarbon.An explanation for this is the following statement.

Accepted Answer

A)   The carbon atoms of cyclopentadiene are all sp2-hybridized.
B)   Cyclopentadiene is aromatic.
C)   Removal of a proton from cyclopentadiene yields an aromatic anion.
D)   Removal of a hydrogen atom from cyclopentadiene yields a highly stable free radical.
E)   Removal of a hydride ion from cyclopentadiene produces an aromatic cation.F) C) and E)
G) C) and D)

Question 10

Which of the following would you expect to be aromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) All of the above
G) A) and B)

Question 11

Which is the only one of these reagents which will react with benzene under the specified conditions?

Accepted Answer

A)   Cl2,FeCl3,heat
B)   H2,25°C
C)   Br2/CCl4,25°C,dark
D)   KMnO4/H2O,25°C
E)   H3O+,heatF) A) and E)
G) A) and C)

Question 12

Which of the following would you expect to be aromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) B) and E)
G) B) and D)

Question 13

Briefly explain why the aromatic hydrocarbon azulene,C10H8,possesses a significant dipole moment.Use diagrams as needed to illustrate/clarify your answer.

Accepted Answer

Azulene has the bicyclic structure shown...

Question 14

Which of these species is aromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) A) and D)
G) B) and C)

Question 15

Which of these species is aromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) A) and C)
G) C) and E)

Question 16

Which of these would you expect to have significant resonance stabilization energy?

Accepted Answer

A)   I
B)   II
C)   III
D)   All of the above
E)   None of the aboveF) None of the above
G) C) and E)

Question 17

How many different dihydroxybromobenzenes are possible?

Accepted Answer

A)   8
B)   7
C)   6
D)   5
E)   4F) C) and D)
G) A) and D)

Question 18

Which of these species is aromatic?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) C) and D)
G) A) and C)

Question 19

Predict the product of the reaction of one equivalent of hydrochloric acid with the organic
compound shown:

Accepted Answer

The answer of Predict the product of the reaction of...

Question 20

Although all bond lengths in benzene are identical,that is not always true for all aromatic compounds.In naphthalene,for instance,the C1-C2 bond is shorter than the C2-C3 bond.Explain,using resonance theory.

Accepted Answer

The major resonance structures for napht...

Exam 14: Aromatic Compounds

Explain briefly why cyclopentadiene readily reacts with strong bases.

Correct AnswerverifiedThe acidity of a substance can be often ...View AnswerShow Answer

Although all bond lengths in benzene are identical,that is not always true for all aromatic compounds.In naphthalene,for instance,the C1-C2 bond is shorter than the C2-C3 bond.Explain,using resonance theory.

Correct AnswerverifiedThe major resonance structures for napht...View AnswerShow Answer

Which of the following would you expect to be antiaromatic?

Correct AnswerverifiedShow Answer

Which of the following would you expect to be aromatic?

Correct AnswerverifiedShow Answer

Which of these species is aromatic?

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Which is the only one of these reagents which will react with benzene under the specified conditions?

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Which of the following statements about cyclooctatetraene is NOT true?

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Which of these species is aromatic?

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Briefly explain why the aromatic hydrocarbon azulene,C10H8,possesses a significant dipole moment.Use diagrams as needed to illustrate/clarify your answer.

Correct AnswerverifiedAzulene has the bicyclic structure shown...View AnswerShow Answer

Draw all significant resonance structures for the cyclopentadienyl anion.

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Which of these species is aromatic?

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How many resonances would be expected in the broad-band decoupled C-13 spectra of:

Correct AnswerverifiedShow Answer

Which of these species is aromatic?

Correct AnswerverifiedShow Answer

In the molecular orbital model of benzene,the six p-orbitals combine to form how many molecular orbitals?

Correct AnswerverifiedShow Answer

How many different dihydroxybromobenzenes are possible?

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Which of the following would you expect to be aromatic?

Correct AnswerverifiedShow Answer

Which reagent(s) /technique would serve to distinguish between azulene and bicyclo[5.3.0]decane?

Correct AnswerverifiedShow Answer

Cyclopentadiene is unusually acidic for a hydrocarbon.An explanation for this is the following statement.

Correct AnswerverifiedShow Answer

Which of these would you expect to have significant resonance stabilization energy?

Correct AnswerverifiedShow Answer

Predict the product of the reaction of one equivalent of hydrochloric acid with the organic compound shown:

Correct AnswerverifiedShow Answer

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The acidity of a substance can be often ...
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The major resonance structures for napht...
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Briefly explain why the aromatic hydrocarbon azulene,C₁₀H₈,possesses a significant dipole moment.Use diagrams as needed to illustrate/clarify your answer.

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Azulene has the bicyclic structure shown...
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