Question 1

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

Accepted Answer

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

Question 2

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 3

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

Accepted Answer

A)  Only I
B)  Only I and III
C)  Only II and IV
D)  Only I,II,and IIIE) A) and D)
F) C) and D)

Question 4

Which of the following statements about the mechanism of the Diels-Alder reaction is true?

Accepted Answer

A)  Three π bonds break; two σ bonds and one π bond form.
B)  Three π bonds break; one σ bond and two π bonds form.
C)  Two π bonds break; one σ bond and one π bond form.
D)  Two π bonds break; two σ bonds and one π bond form.E) B) and C)
F) B) and D)

Question 5

Which of the following compounds is conjugated?

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

Why would the compound below not react with a dienophile in a Diels-Alder reaction?

Accepted Answer

A)  The compound is not a conjugated diene.
B)  There are no electron withdrawing groups on the compound.
C)  There are no electron donating groups on the compound.
D)  The compound cannot adopt the s-cis conformation.E) All of the above
F) A) and B)

Question 8

What is the major organic product of the following reaction?

Accepted Answer

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

Question 9

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,and IIIE) All of the above
F) A) and D)

Question 10

How would you favor the formation of the kinetic product of the following reaction?

Accepted Answer

A)  Excess HBr
B)  Long reaction time
C)  Low temperature
D)  High pressureE) None of the above
F) B) and C)

Question 11

What is the hybridization around the indicated oxygen 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) B) and C)

Question 12

What is the major product of the following reaction?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

What is the major product of the following reaction?

Accepted Answer

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

Question 15

Which of the following is not a resonance structure of acetic anhydride?

Accepted Answer

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

Question 16

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

Question 17

Which of the following statements about resonance structures is true?

Accepted Answer

A)  The placement of atoms is different.
B)  The placement of p bonds is different.
C)  The placement of s bonds is different.
D)  The placement of nonbonded electrons is the same.E) A) and D)
F) C) and D)

Question 18

Which triene has the smallest heat of hydrogenation?

Accepted Answer

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

Question 19

Which of the following conjugated dienes represent two conformations?

Accepted Answer

A)  Only I and II
B)  Only I and III
C)  Only II and III
D)  None of the choicesE) A) and C)
F) A) and B)

Question 20

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 π and nonbonding electrons
D)  Structures that differ only in the location of bondsE) A) and B)
F) A) and C)

Exam 14: Conjugation, resonance, and Dienes

Which of the following statements about the mechanism of the Diels-Alder reaction is true?

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

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Which of the following compounds is conjugated?

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What is the major product of the following reaction?

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What is the definition of a resonance structure?

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What is the major organic product of the following reaction?

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

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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 compounds is the least reactive dienophile in a Diels-Alder reaction?

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How would you favor the formation of the kinetic product of the following reaction?

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Which of the following is not a resonance structure of acetic anhydride?

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

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Why would the compound below not react with a dienophile in a Diels-Alder reaction?

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Which triene has the smallest heat of hydrogenation?

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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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Which of the following conjugated dienes represent two conformations?

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Which of the following statements about resonance structures is true?

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What is the major product of the following reaction?

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