Question 1

Consider the following spectrum for a conjugated diene. max would be: A) close to 217 nm B) less than 217 nm C) greater than 217 nm" class="answers-bank-image d-inline" rel="preload" > If a similar spectrum were taken for a conjugated tetraene,the λmax would be:

Accepted Answer

A)  close to 217 nm
B)  less than 217 nm
C)  greater than 217 nmD) A) and B)
E) A) and C)

Question 2

For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield the dienophile 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) C) and D)
F) None of the above

Question 3

What is the concentration of a solution of a plant pigment (ε = 37,500)  if an Absorbance of 0.751 were obtained in a cell with a 5.00 cm path length?

Accepted Answer

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

Question 4

Draw: 2-methyl-1,3-butadiene

Accepted Answer

The answer of Draw: 2-methyl-1,3-butadiene...

Question 5

Draw: (2Z,4Z)-hexadiene

Accepted Answer

The answer of Draw: (2Z,4Z)-hexadiene...

Question 6

​Calculate the concentration of β-carotene in a sample which is placed in a cell with a pathlength of 1.0 cm and the UV absorbance reads 0.56.The molar absorbtivity of β-carotene is found to be 138,000 L mol-1 cm-1.

Accepted Answer

Question 7

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

Accepted Answer

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

Question 8

Name:

Accepted Answer

2,3,4,5-te...

Question 9

Based on the following spectrum,what is the energy in kilojoules per mole of photons that corresponds to the λmax? max?   A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   max?   
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   max?   
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   max?   
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   max?   
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   max?   
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) C) and D)
G) All of the above D

Question 10

​The unit for molar absorptivity is:

Accepted Answer

A)  ​L/cm
B)  ​(L .mol) /cm
C)  ​L/(mol .cm) 
D)  ​mol/LE) A) and B)
F) A) and C)

Question 11

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation.High energy radiation like gamma rays is of:

Accepted Answer

A)  low frequency and short wavelength
B)  low frequency and long wavelength
C)  high frequency and short wavelength
D)  high frequency and long wavelengthE) A) and B)
F) C) and D)

Question 12

​Draw the mechanism of the bromination of 1,3-pentadiene and indicate the major and minor products.

Accepted Answer

The answer of ​Draw the mechanism of the bromination of...

Question 13

A physical constant that is the quantitative measure of the amount of UV light absorbed by a compound.

Accepted Answer

A)  A
B)  ε
C)  λmax
D)  π*E) A) and D)
F) B) and C)

Question 14

Which of the following arises from π to π* transitions?

Accepted Answer

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

Question 15

Name:

Accepted Answer

(3E)-2-met...

Question 16

Electrophilic addition reaction of conjugated dienes that occur at high temperature and/or long reaction times (reversible conditions)  are said to be under:

Accepted Answer

A)  1,2-control
B)  kinetic control
C)  1,4-control
D)  thermodynamic controlE) C) and D)
F) B) and C)

Question 17

In 1839,Charles Goodyear discovered a process by which both natural and synthetic rubbers are hardened.This process is called:

Accepted Answer

A)  diazotization
B)  vulcanization
C)  polymerization
D)  condensationE) A) and B)
F) B) and D)

Question 18

Which of the following compounds will react as a diene in a Diels-Alder reaction?

Accepted Answer

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

Question 19

​Draw the mechanism of the bromination of 2-ethyl-1,3-pentadiene.

Accepted Answer

​

Question 20

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

Accepted Answer

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

Exam 14: Conjugated Compounds and Ultraviolet Spectroscopy

Consider the following spectrum for a conjugated diene. If a similar spectrum were taken for a conjugated tetraene,the λmax would be:

Correct AnswerverifiedShow Answer

For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield the dienophile must:

Correct AnswerverifiedShow Answer

What is the concentration of a solution of a plant pigment (ε = 37,500) if an Absorbance of 0.751 were obtained in a cell with a 5.00 cm path length?

Correct AnswerverifiedShow Answer

Draw: 2-methyl-1,3-butadiene

Correct Answerverified11eab917_1509_ee22_99e6_03b345f397f6_TB4944_00

Draw: (2Z,4Z)-hexadiene

Correct AnswerverifiedShow Answer

​Calculate the concentration of β-carotene in a sample which is placed in a cell with a pathlength of 1.0 cm and the UV absorbance reads 0.56.The molar absorbtivity of β-carotene is found to be 138,000 L mol-1 cm-1.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Name:

Correct Answerverified2,3,4,5-te...View AnswerShow Answer

Based on the following spectrum,what is the energy in kilojoules per mole of photons that corresponds to the λmax?

Correct AnswerverifiedD

​The unit for molar absorptivity is:

Correct AnswerverifiedShow Answer

The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation.High energy radiation like gamma rays is of:

Correct AnswerverifiedShow Answer

​Draw the mechanism of the bromination of 1,3-pentadiene and indicate the major and minor products.

Correct AnswerverifiedShow Answer

A physical constant that is the quantitative measure of the amount of UV light absorbed by a compound.

Correct AnswerverifiedShow Answer

Which of the following arises from π to π* transitions?

Correct AnswerverifiedShow Answer

Name:

Correct Answerverified(3E)-2-met...View AnswerShow Answer

Electrophilic addition reaction of conjugated dienes that occur at high temperature and/or long reaction times (reversible conditions) are said to be under:

Correct AnswerverifiedShow Answer

In 1839,Charles Goodyear discovered a process by which both natural and synthetic rubbers are hardened.This process is called:

Correct AnswerverifiedShow Answer

Which of the following compounds will react as a diene in a Diels-Alder reaction?

Correct AnswerverifiedShow Answer

​Draw the mechanism of the bromination of 2-ethyl-1,3-pentadiene.

Correct Answerverified11eab917_150b_ea1a_99e6_d964b7fb8bbd_TB4944_00 ​

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

Correct AnswerverifiedShow Answer

Consider the following spectrum for a conjugated diene. If a similar spectrum were taken for a conjugated tetraene,the λ_max would be:

Correct Answer
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11eab917_1509_ee22_99e6_03b345f397f6_TB4944_00

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Calculate the concentration of β-carotene in a sample which is placed in a cell with a pathlength of 1.0 cm and the UV absorbance reads 0.56.The molar absorbtivity of β-carotene is found to be 138,000 L mol^-1 cm^-1.

Correct Answer
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Correct Answer
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Correct Answer
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2,3,4,5-te...
View Answer

Based on the following spectrum,what is the energy in kilojoules per mole of photons that corresponds to the λ_max?

Correct Answer
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The unit for molar absorptivity is:

Correct Answer
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Draw the mechanism of the bromination of 1,3-pentadiene and indicate the major and minor products.

Correct Answer
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(3E)-2-met...
View Answer

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Draw the mechanism of the bromination of 2-ethyl-1,3-pentadiene.

Correct Answer
verified
11eab917_150b_ea1a_99e6_d964b7fb8bbd_TB4944_00

Correct Answer
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