Question 1

2-Chloro-1,3-butadiene is polymerized to yield an excellent,expensive synthetic rubber with good weather resistance called:

Accepted Answer

A)  diprene
B)  isoprene
C)  styrene
D)  neopreneE) B) and C)
F) A) and C)

Question 2

Which of the following has the highest degree of conjugation? Atoms other than carbon and hydrogen are labeled.

Accepted Answer

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

Question 3

Based on the following table,in which compound is the energy difference between the HOMO and LUMO the largest?

Accepted Answer

A)  W
B)  X
C)  Y
D)  ZE) B) and D)
F) A) and D)

Question 4

Exhibit 14-7
Consider the reaction below to answer the following question(s) . 
-Refer to Exhibit 14-7.This is an example of a(n)  ____________ reaction.

Accepted Answer

A)  Woodward-Hoffman
B)  conjugate addition
C)  Diels-Alder
D)  electrophilic additionE) A) and C)
F) A) and D)

Question 5

​What would be the stereochemistry of the product of the following reaction?  ​

Accepted Answer

The answer of ​What would be the stereochemistry of the...

Question 6

​Which of the following is the most likely to happen when a conjugated diene is irradiated with ultraviolet light?

Accepted Answer

A)  ​The bonds between different atoms in the molecule undergo symmetric stretching.
B)  ​A  electron is promoted from the highest occupied molecular orbital to the lowest unoccupied molecular orbital.
C)  ​A  electron is demoted from the lowest occupied molecular orbital to the highest unoccupied molecular orbital.
D)  ​The bonds between different atoms in the molecule undergo asymmetric stretching.E) A) and D)
F) C) and D)

Question 7

Exhibit 14-2
Consider the reaction below to answer the following question(s): 
-Refer to Exhibit 14-2.Write a stepwise mechanism that accounts for both of the products shown.Show all intermediate structures and electron flow with arrows.

Accepted Answer

The answer of Exhibit 14-2
Consider the reaction below to answer...

Question 8

Which of the following compounds would show the longest wavelength λmax in its UV spectrum?

Accepted Answer

A)   max in its UV spectrum? 
A)     
B)     
C)     
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B)   max in its UV spectrum? 
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B)     
C)     
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C)   max in its UV spectrum? 
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B)     
C)     
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D)   max in its UV spectrum? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >E) None of the above
F) All of the above

Question 9

Exhibit 14-7
Consider the reaction below to answer the following question(s). 
-Refer to Exhibit 14-7.The dienophile in the reaction is ____.

Accepted Answer

The answer of Exhibit 14-7
Consider the reaction below to answer...

Question 10

Consider the following data for a series of hypothetical plant pigments. Pigment
Ε
QT7
15,300
XR4
41,000
B78
30,800
L99
10,600
The Absorbance of a  solution containing one of these pigments,measured in a 1.00 cm cell,was 0.345.Which pigment was in the solution?

Accepted Answer

A)  QT7
B)  XR4
C)  B78
D)  L99E) A) and B)
F) A) and C)

Question 11

Draw the skeletal formulas for the product of the reaction of the following with HBr.

Accepted Answer

1,2-additions and 1,...

Question 12

Exhibit 14-2
Consider the reaction below to answer the following question(s): 
-Refer to Exhibit 14-2.The kinetically controlled product in this reaction is _____.

Accepted Answer

The answer of Exhibit 14-2
Consider the reaction below to answer...

Question 13

If ΔH°hydrog for a monosubstituted alkene is 126 kJ/mol,which of the following systems is most likely to be a conjugated system?

Accepted Answer

A)  3 double bonds,ΔH°hydrog = 379 kJ/mol
B)  2 double bond,ΔH°hydrog = 254 kJ/mol
C)  4 double bonds,ΔH°hydrog = 505 kJ/mol
D)  None of these are likely to be conjugated.E) All of the above
F) B) and D)

Question 14

Exhibit 14-2
Consider the reaction below to answer the following question(s): 
-Refer to Exhibit 14-2.The electrophile in this reaction is ____.

Accepted Answer

The answer of Exhibit 14-2
Consider the reaction below to answer...

Question 15

​Draw the mechanism of the Diels-Alder reaction between propenal and 2-methyl-1,3-butadiene.

Accepted Answer

The answer of ​Draw the mechanism of the Diels-Alder reaction...

Question 16

For a diene to undergo a Diels-Alder reaction it must:

Accepted Answer

A)  be substituted with electron-withdrawing groups
B)  be able to adopt an s-trans conformation
C)  be substituted with electron-donating groups
D)  be able to adopt an s-cis conformationE) A) and C)
F) A) and B)

Question 17

​Which of the following compounds is the most stable?

Accepted Answer

A)  ​penta-2,3-diene
B)  ​2,4-hexadiene
C)  ​1,4-pentadiene
D)  ​3,6-octadieneE) All of the above
F) None of the above

Question 18

Exhibit 14-2
Consider the reaction below to answer the following question(s): 
-Refer to Exhibit 14-2.The product that results from 1,4-addition is _____.

Accepted Answer

The answer of Exhibit 14-2
Consider the reaction below to answer...

Question 19

When an organic molecule is irradiated with ultraviolet radiation,the energy absorbed by the molecule corresponds to:

Accepted Answer

A)  the amount necessary to increase molecular motions in functional groups
B)  the amount necessary to excite electrons from one molecular orbital to another
C)  the amount necessary to "flip" the spin of atomic nuclei
D)  the amount necessary to strip a molecule of one electron to generate a radical cationE) C) and D)
F) B) and D)

Question 20

Exhibit 14-2
Consider the reaction below to answer the following question(s): 
-Refer to Exhibit 14-2.This reaction shows the preferred electrophilic addition of HBr to this unsymmetrical alkene.Draw the products of electrophilic addition to the opposite end of the conjugated diene.

Accepted Answer

The answer of Exhibit 14-2
Consider the reaction below to answer...

Exam 14: Conjugated Compounds and Ultraviolet Spectroscopy

​Which of the following compounds is the most stable?

Correct AnswerverifiedShow Answer

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The product that results from 1,4-addition is _____.

Correct AnswerverifiedShow Answer

If ΔH°hydrog for a monosubstituted alkene is 126 kJ/mol,which of the following systems is most likely to be a conjugated system?

Correct AnswerverifiedShow Answer

​Which of the following is the most likely to happen when a conjugated diene is irradiated with ultraviolet light?

Correct AnswerverifiedShow Answer

Which of the following compounds would show the longest wavelength λmax in its UV spectrum?

Correct AnswerverifiedShow Answer

​What would be the stereochemistry of the product of the following reaction? ​

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​Draw the mechanism of the Diels-Alder reaction between propenal and 2-methyl-1,3-butadiene.

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Exhibit 14-7 Consider the reaction below to answer the following question(s). -Refer to Exhibit 14-7.The dienophile in the reaction is ____.

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Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.Write a stepwise mechanism that accounts for both of the products shown.Show all intermediate structures and electron flow with arrows.

Correct AnswerverifiedShow Answer

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The kinetically controlled product in this reaction is _____.

Correct AnswerverifiedShow Answer

Draw the skeletal formulas for the product of the reaction of the following with HBr.

Correct Answerverified1,2-additions and 1,...View AnswerShow Answer

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.The electrophile in this reaction is ____.

Correct AnswerverifiedShow Answer

Consider the following data for a series of hypothetical plant pigments. Pigment Ε QT7 15,300 XR4 41,000 B78 30,800 L99 10,600 The Absorbance of a solution containing one of these pigments,measured in a 1.00 cm cell,was 0.345.Which pigment was in the solution?

Correct AnswerverifiedShow Answer

2-Chloro-1,3-butadiene is polymerized to yield an excellent,expensive synthetic rubber with good weather resistance called:

Correct AnswerverifiedShow Answer

Which of the following has the highest degree of conjugation? Atoms other than carbon and hydrogen are labeled.

Correct AnswerverifiedShow Answer

For a diene to undergo a Diels-Alder reaction it must:

Correct AnswerverifiedShow Answer

Exhibit 14-7 Consider the reaction below to answer the following question(s) . -Refer to Exhibit 14-7.This is an example of a(n) ____________ reaction.

Correct AnswerverifiedShow Answer

Exhibit 14-2 Consider the reaction below to answer the following question(s): -Refer to Exhibit 14-2.This reaction shows the preferred electrophilic addition of HBr to this unsymmetrical alkene.Draw the products of electrophilic addition to the opposite end of the conjugated diene.

Correct AnswerverifiedShow Answer

Based on the following table,in which compound is the energy difference between the HOMO and LUMO the largest?

Correct AnswerverifiedShow Answer

When an organic molecule is irradiated with ultraviolet radiation,the energy absorbed by the molecule corresponds to:

Correct AnswerverifiedShow Answer

Which of the following compounds is the most stable?

Correct Answer
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If ΔH°_hydrog for a monosubstituted alkene is 126 kJ/mol,which of the following systems is most likely to be a conjugated system?

Correct Answer
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Which of the following is the most likely to happen when a conjugated diene is irradiated with ultraviolet light?

Correct Answer
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Which of the following compounds would show the longest wavelength λ_max in its UV spectrum?

Correct Answer
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What would be the stereochemistry of the product of the following reaction?

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Draw the mechanism of the Diels-Alder reaction between propenal and 2-methyl-1,3-butadiene.

Correct Answer
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1,2-additions and 1,...
View Answer

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