Question 1

Consider the following reaction.  This is an example of a sigmatropic reaction with a [3,3]-shift.

Accepted Answer

A) True 
 B)False

Question 2

What is the IUPAC name of the following compound?

Accepted Answer

A)  2,3-dimethyl-2,4-pentadiene
B)  (Z) -2,3-dimethyl-2,4-pentadiene
C)  3,4-dimethyl-1,3-pentadiene
D)  (Z) -3,4-dimethyl-1,3-pentadieneE) None of the above
F) A) and B)

Question 3

Consider the reaction below to answer the following question(s):  Enter the appropriate letter in the blank for each the following statements.
-Consider the following spectrum for a conjugated diene.  If a similar spectrum were taken for a conjugated tetraene, the $\lambda$max would be _________than 217 nm.

Accepted Answer

Question 4

What is (are)  the major organic product(s)  formed in the following reaction?

Accepted Answer

A)  only 1
B)  only 1 and 2
C)  only 1 and 3
D)  only 2 and 4E) B) and C)
F) B) and D)

Question 5

Which of the following arrangements of p atomic orbitals gives the highest energy  π\piπ -antibonding molecular orbital of 1,3-butadiene?

Accepted Answer

A)  1
B)  2
C)  3
D)  4 E) All of the above
F) C) and D)

Question 6

What is the reactive intermediate in the reaction of 1,3-butadiene with HBr resulting in 1,2-addition?

Accepted Answer

A)  cyclic bromonium cation
B)  allylic cation
C)  allylic radical
D)  dienophileE) B) and C)
F) All of the above

Question 7

Consider the reaction below to answer the following question(s) :  Enter the appropriate letter in the blank for each the following statements.
-The nucleophile in this reaction is ____.

Accepted Answer

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

Question 8

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

Accepted Answer

A)  3,4-dibromo-1-butene
B)  (
E)  -1,4-dibromo-2-butene
C)  (Z) -1,4-dibromo-2-butene
D)  (Z) -2,3-dibromo-2-buteneE) All of the above
F) A) and B)

Question 9

What is (are)  the major organic product(s)  formed in the following reaction?

Accepted Answer

A)  only 1
B)  only 2
C)  only 1 and 3
D)  only 2 and 4E) A) and D)
F) C) and D)

Question 10

Consider the following reaction.  This is an example of a sigmatropic reaction with a [3,3]-shift.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following are conjugated dienes?

Accepted Answer

A)  only 1
B)  only 2
C)  only 1 and 2
D)  1, 2 and 3E) B) and D)
F) A) and B)

Question 12

Consider the reaction below to answer the following question(s) .  Fill in the blank in the question with the appropriate letter.
-The diene in the reaction is ____.

Accepted Answer

A)  A
B)  B
C)  CD) A) and C)
E) A) and B)

Question 13

What range of wavelengths corresponds to the ultraviolet region of the electromagnetic spectrum?

Accepted Answer

A)  200-400 nm
B)  400-700 nm
C)  2.5-25  μ\muμ m
D)  2-10 mm E) C) and D)
F) None of the above

Question 14

Which of the following has the highest value of  λ\lambdaλ max in the ultraviolet-visible spectrum? max in the ultraviolet-visible spectrum?   A) 1 B) 2 C) 3 D) 4 " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1
B)  2
C)  3
D)  4 E) A) and D)
F) B) and D)

Question 15

Which of the following processes takes place upon absorption of ultraviolet-visible radiation?

Accepted Answer

A)  bond vibration
B)  electron excitation
C)  nuclear spin flip
D)  electron spin flipE) B) and C)
F) All of the above

Question 16

Which of the following relationships is not valid as applied to ultraviolet-visible spectroscopy?

Accepted Answer

A)  "A = log (Io/I) "
B)  "A =  ε\varepsilonε cl"
C)  " Δ\DeltaΔ E = hv"
D)  "A =  λ\lambdaλ maxl" E) All of the above
F) A) and D) D

Question 17

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?

Accepted Answer

1,3-Cyclohexadiene, in which t...

Question 18

Which of the following arrangements of p atomic orbitals of 1,3-butadiene has the greatest number of nodes?

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) A) and B)
F) A) and C)

Question 19

What are the units of  ε\varepsilonε  in ultraviolet-visible spectroscopy?

Accepted Answer

A)  M-1.cm-1
B)  M.cm
C)  J.mol-1.M-1
D)  none,   ε\varepsilonε  is a dimensionless quantity E) A) and D)
F) None of the above A

Question 20

Which of the following are conjugated dienes?

Accepted Answer

A)  only 1
B)  only 2
C)  only 1 and 2
D)  1, 2 and 3E) B) and C)
F) C) and D)

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

Correct Answer
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What is the IUPAC name of the following compound?

Correct Answer
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Correct Answer
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What is (are) the major organic product(s) formed in the following reaction?

Correct Answer
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Which of the following arrangements of p atomic orbitals gives the highest energy $\pi$ -antibonding molecular orbital of 1,3-butadiene? $Which of the following arrangements of p atomic orbitals gives the highest energy \pi -antibonding molecular orbital of 1,3-butadiene? A) 1 B) 2 C) 3 D) 4$

Correct Answer
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What is the reactive intermediate in the reaction of 1,3-butadiene with HBr resulting in 1,2-addition?

Correct Answer
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Consider the reaction below to answer the following question(s) : Enter the appropriate letter in the blank for each the following statements. -The nucleophile in this reaction is ____.

Correct Answer
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A

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

Correct Answer
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What is (are) the major organic product(s) formed in the following reaction?

Correct Answer
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Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

Correct Answer
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Which of the following are conjugated dienes?

Correct Answer
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Consider the reaction below to answer the following question(s) . Fill in the blank in the question with the appropriate letter. -The diene in the reaction is ____.

Correct Answer
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What range of wavelengths corresponds to the ultraviolet region of the electromagnetic spectrum?

Correct Answer
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Which of the following has the highest value of $\lambda$ _max in the ultraviolet-visible spectrum? $Which of the following has the highest value of \lambda <sub>max</sub> in the ultraviolet-visible spectrum? A) 1 B) 2 C) 3 D) 4$

Correct Answer
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Which of the following processes takes place upon absorption of ultraviolet-visible radiation?

Correct Answer
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Which of the following relationships is not valid as applied to ultraviolet-visible spectroscopy?

Correct Answer
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D

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?

Correct Answer
verified
1,3-Cyclohexadiene, in which t...
View Answer

Which of the following arrangements of p atomic orbitals of 1,3-butadiene has the greatest number of nodes?

Correct Answer
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What are the units of $\varepsilon$ in ultraviolet-visible spectroscopy?

Correct Answer
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A

Which of the following are conjugated dienes?

Correct Answer
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Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

Correct AnswerverifiedShow Answer

What is the IUPAC name of the following compound?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is (are) the major organic product(s) formed in the following reaction?

Correct AnswerverifiedShow Answer

Which of the following arrangements of p atomic orbitals gives the highest energy π\piπ -antibonding molecular orbital of 1,3-butadiene?

Correct AnswerverifiedShow Answer

What is the reactive intermediate in the reaction of 1,3-butadiene with HBr resulting in 1,2-addition?

Correct AnswerverifiedShow Answer

Consider the reaction below to answer the following question(s) : Enter the appropriate letter in the blank for each the following statements. -The nucleophile in this reaction is ____.

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

What is (are) the major organic product(s) formed in the following reaction?

Correct AnswerverifiedShow Answer

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

Correct AnswerverifiedShow Answer

Which of the following are conjugated dienes?

Correct AnswerverifiedShow Answer

Consider the reaction below to answer the following question(s) . Fill in the blank in the question with the appropriate letter. -The diene in the reaction is ____.

Correct AnswerverifiedShow Answer

What range of wavelengths corresponds to the ultraviolet region of the electromagnetic spectrum?

Correct AnswerverifiedShow Answer

Which of the following has the highest value of λ\lambdaλ max in the ultraviolet-visible spectrum?

Correct AnswerverifiedShow Answer

Which of the following processes takes place upon absorption of ultraviolet-visible radiation?

Correct AnswerverifiedShow Answer

Which of the following relationships is not valid as applied to ultraviolet-visible spectroscopy?

Correct AnswerverifiedD

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?

Correct Answerverified1,3-Cyclohexadiene, in which t...View AnswerShow Answer

Which of the following arrangements of p atomic orbitals of 1,3-butadiene has the greatest number of nodes?

Correct AnswerverifiedShow Answer

What are the units of ε\varepsilonε in ultraviolet-visible spectroscopy?

Correct AnswerverifiedA

Which of the following are conjugated dienes?

Correct AnswerverifiedShow Answer

Correct Answer
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Which of the following arrangements of p atomic orbitals gives the highest energy $\pi$ -antibonding molecular orbital of 1,3-butadiene? $Which of the following arrangements of p atomic orbitals gives the highest energy \pi -antibonding molecular orbital of 1,3-butadiene? A) 1 B) 2 C) 3 D) 4$

Correct Answer
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Correct Answer
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Correct Answer
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A

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which of the following has the highest value of $\lambda$ _max in the ultraviolet-visible spectrum? $Which of the following has the highest value of \lambda <sub>max</sub> in the ultraviolet-visible spectrum? A) 1 B) 2 C) 3 D) 4$

Correct Answer
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Correct Answer
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Correct Answer
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D

Correct Answer
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1,3-Cyclohexadiene, in which t...
View Answer

Correct Answer
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What are the units of $\varepsilon$ in ultraviolet-visible spectroscopy?

Correct Answer
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A

Correct Answer
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