Question 1

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

Accepted Answer

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

Question 2

Rank the following dienes in order of increasing reactivity in a Diels-Alder reaction,listing the least reactive first.

Accepted Answer

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

Question 3

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) B) and D)

Question 4

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 C)
F) A) and B)

Question 5

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

Question 6

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 C)
F) A) and B) C

Question 7

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
C)  Dienophile
D)  Allylic carbocationE) B) and C)
F) C) and D)

Question 8

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

Question 9

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) D

Question 10

What is the major product of the following reaction?

Accepted Answer

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

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 C)

Question 12

Which of the following is (are) conjugated dienes?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

Which of the following electronic transitions is common in the UV spectrum of 1,3-butadiene?

Accepted Answer

A)  s®p
B)  s®p*
C)  n ®p*
D)  p®p*E) B) and D)
F) All of the above

Question 15

Which of the following statements about kinetic vs.thermodynamic products is true?

Accepted Answer

A)  The product that is formed faster is the thermodynamic product.
B)  The kinetic product predominates at low temperature.
C)  The product that predominates at equilibrium is the kinetic product.
D)  The thermodynamic product is less stable.E) A) and D)
F) B) and D) B

Question 16

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

Question 17

Which triene absorbs the longest wavelength of UV light?

Accepted Answer

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

Question 18

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

Question 19

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

Question 20

Rank the following compounds in order of increasing stability,putting the least stable first.

Accepted Answer

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

Exam 14: Conjugation,resonance,and Dienes

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

Correct AnswerverifiedShow Answer

Rank the following dienes in order of increasing reactivity in a Diels-Alder reaction,listing the least reactive first.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements about resonance structures is true?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the definition of a resonance structure?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

Which of the following dienes contain conjugated double bonds?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

What is the major product of the following reaction?

Correct AnswerverifiedShow Answer

What is the major organic product of the following reaction?

Correct AnswerverifiedShow Answer

Which of the following is (are) conjugated dienes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following electronic transitions is common in the UV spectrum of 1,3-butadiene?

Correct AnswerverifiedShow Answer

Which of the following statements about kinetic vs.thermodynamic products is true?

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

Which triene absorbs the longest wavelength of UV light?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Rank the following compounds in order of increasing stability,putting the least stable first.

Correct AnswerverifiedShow Answer

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C

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D

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B

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