Question 1

What is the correct order of exothermicity for hydrogenation of the following hexadienes upon treatment with H2/Pd (more exothermic > less exothermic) ? 2/Pd (more exothermic > less exothermic) ?   A)  1 > 2 > 3 B)  3 > 1 > 2 C)  2 > 1 > 3 D)  3 > 2 > 1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 2

Which of the following laws relates absorbance to the concentration of a sample and the pathlength in ultraviolet-visible spectroscopy?

Accepted Answer

A)   Buzz-Beer law
B)   Beer-Lambert law
C)   Duff-Beer law
D)   Christopher-Lambert lawE) A) and D)
F) A) and C)

Question 3

What is the major organic product obtained from the following reaction?

Accepted Answer

The answer of What is the major organic product obtained...

Question 4

What quantity is abbreviated as e in ultraviolet-visible spectroscopy?

Accepted Answer

A)   absorbance
B)   molecular absorptivity
C)   intensity of transmitted light
D)   wavelength of maximum absorbanceE) B) and C)
F) A) and D)

Question 5

Which of the following electronic transitions is apparent in the ultraviolet-visible spectrum of 1,3-butadiene?

Accepted Answer

A)   n→p*
B)   p→p *
C)   s→p *
D)   s→pE) None of the above
F) A) and B)

Question 6

Which of the following energy diagrams represents the electronic state of the ground state of 1,3-butadiene?

Accepted Answer

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

Question 7

Which of the following is not a major organic product obtained from the addition of 1 mole of bromine to (E) -1,3-pentadiene?

Accepted Answer

A)   (
E)  -4,5-dibromo-2-pentene
B)   3,4-dibromo-1-pentene
C)   (
E)  -1,4-dibromo-2-pentene
D)   (
E)  -1,2-dibromo-2-penteneE) C) and D)
F) B) and D)

Question 8

What is the IUPAC name of the following compound?

Accepted Answer

(E)-2,3-di...

Question 9

What are the units of e in ultraviolet-visible spectroscopy?

Accepted Answer

A)   M-1*cm-1
B)   M*cm
C)   J*mol-1*M-1
D)   none, e is a dimensionless quantityE) A) and D)
F) A) and C)

Question 10

Draw two resonance structures of the reactive intermediate that accounts for the formation of 1,2- and 1,4-addition products upon reaction of 1,3-butadiene with one equivalent of HBr.

Accepted Answer

The answer of Draw two resonance structures of the reactive...

Question 11

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

Accepted Answer

A)   only 1
B)   only 1 and 3
C)   only 2 and 4
D)   only 1 and 4E) None of the above
F) All of the above

Question 12

Which of the following electronic transitions is (are)  apparent in the ultraviolet-visible spectrum of acrolein, H2C=CHCHO? 
1.n→p*
2.p→p*
3.s→ p*

Accepted Answer

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

Question 13

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 B)
F) B) and D)

Question 14

What is the IUPAC name of the following compound?

Accepted Answer

(E)-2,3-di...

Question 15

Which of the following alkenes undergoes the least exothermic hydrogenation upon treatment with H2/Pd 2/Pd   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)   4E) B) and D)
F) C) and D)

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

A)   A = log (Io/I) 
B)   A = ecl
C)   DE = hn
D)   A = lmaxlE) A) and C)
F) B) and C)

Question 18

What are the two major organic products obtained from the following reaction?

Accepted Answer

The answer of What are the two major organic products...

Question 19

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) A) and D)

Question 20

Which of the following has the highest value of lmax 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)   4E) None of the above
F) A) and B)

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

Which of the following laws relates absorbance to the concentration of a sample and the pathlength in ultraviolet-visible spectroscopy?

Correct AnswerverifiedShow Answer

Which of the following energy diagrams represents the electronic state of the ground state of 1,3-butadiene?

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?

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What are the units of e in ultraviolet-visible spectroscopy?

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 Answerverified(E)-2,3-di...View AnswerShow Answer

What is the major organic product obtained from the following reaction?

Correct AnswerverifiedShow Answer

What are the two major organic products obtained from the following reaction?

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What quantity is abbreviated as e in ultraviolet-visible spectroscopy?

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

Correct AnswerverifiedShow Answer

Draw two resonance structures of the reactive intermediate that accounts for the formation of 1,2- and 1,4-addition products upon reaction of 1,3-butadiene with one equivalent of HBr.

Correct AnswerverifiedShow Answer

Which of the following is not a major organic product obtained from the addition of 1 mole of bromine to (E) -1,3-pentadiene?

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Which of the following has the highest value of lmax in the ultraviolet-visible spectrum?

Correct AnswerverifiedShow Answer

What is the IUPAC name of the following compound?

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

Which of the following electronic transitions is apparent in the ultraviolet-visible spectrum of 1,3-butadiene?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following alkenes undergoes the least exothermic hydrogenation upon treatment with H2/Pd

Correct AnswerverifiedShow Answer

What is the correct order of exothermicity for hydrogenation of the following hexadienes upon treatment with H2/Pd (more exothermic > less exothermic) ?

Correct AnswerverifiedShow Answer

Which of the following electronic transitions is (are) apparent in the ultraviolet-visible spectrum of acrolein, H2C=CHCHO? 1.n→p* 2.p→p* 3.s→ p*

Correct AnswerverifiedShow Answer

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(E)-2,3-di...
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Which of the following has the highest value of l_max in the ultraviolet-visible spectrum?

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(E)-2,3-di...
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Which of the following alkenes undergoes the least exothermic hydrogenation upon treatment with H₂/Pd

Correct Answer
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What is the correct order of exothermicity for hydrogenation of the following hexadienes upon treatment with H₂/Pd (more exothermic > less exothermic) ?

Correct Answer
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Which of the following electronic transitions is (are) apparent in the ultraviolet-visible spectrum of acrolein, H₂C=CHCHO? 1.n→p* 2.p→p* 3.s→ p*

Correct Answer
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