Question 1

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) None of the above
F) All of the above A

Question 2

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

Question 3

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

Question 4

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

Question 5

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 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 D)
F) A) and B)

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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 B)
F) A) and C)

Question 11

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

Question 12

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

Question 13

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) All of the above

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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 19

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

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

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

Correct Answer
verified
A

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
D

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

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

Correct Answer
verified

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
verified

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

Correct Answer
verified

What is the IUPAC name of the following compound?

Correct Answer
verified

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

Correct Answer
verified

Which of the following are conjugated dienes?

Correct Answer
verified

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

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
verified
A

Which of the following are conjugated dienes?

Correct Answer
verified

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

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

Correct AnswerverifiedA

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

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

What is the IUPAC name of the following compound?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following are conjugated dienes?

Correct AnswerverifiedShow Answer

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

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

Which of the following are conjugated dienes?

Correct AnswerverifiedShow Answer

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

Correct Answer
verified
A

Correct Answer
verified

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
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

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
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified
A

Correct Answer
verified