Question 1

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

Question 2

Which of the following reaction coordinate diagrams explains the formation of different thermodynamic (T)  and kinetic products from the same reactants (R) ?

Accepted Answer

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

Question 3

Why carbonyl groups of aldehydes and ketones on conjugation with carbon-carbon double bonds show strong absorption in the ultraviolet spectrum?

Accepted Answer

The presence of conjugation in aldehydes...

Question 4

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

The answer of Consider the reaction below to answer the...

Question 5

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

Question 6

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 C)
F) None of the above

Question 7

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 D)
F) A) and C)

Question 8

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 9

Sigmatropic shifts, cycloaddition reactions and anuulation reactions are all examples of pericyclic reactions.

Accepted Answer

A) True 
 B)False

Question 10

For a diene to undergo a Diels-Alder reaction it must be able to adopt an s-trans conformation.

Accepted Answer

A) True 
 B)False

Question 11

Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the most exothermic reaction with H2 in the presence of a catalyst). Provide a brief explanation for your choice ?

Accepted Answer

1,4-Cyclohexadiene has a great...

Question 12

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

Accepted Answer

A)   M−1⋅cm−1
B)   M⋅cm
C)   J⋅mol−1⋅M−1
D)   none, ε is a dimensionless quantityE) A) and D)
F) All of the above

Question 13

What is the thermodynamic 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 C)
F) B) and D)

Question 14

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 15

Identify the product of the given reaction. ​

Accepted Answer

A)   I
B)   II
C)   IV
D)   IIIE) C) and D)
F) B) and D)

Question 16

What is the systematic IUPAC name of the following compound?

Accepted Answer

A)   (3S,4
E)  -3-ethyl-3,4-dimethyl-1,4-hexadiene
B)   (3R,4
E)  -3-ethyl-3,4-dimethyl-1,4-hexadiene
C)   (3S,4Z) -3-ethyl-3,4-dimethyl-1,4-hexadiene
D)   (3R,4Z) -3-ethyl-3,4-dimethyl-1,4-hexadieneE) B) and C)
F) A) and D)

Question 17

Provide the structures of the constitutional isomers of the two major organic products obtained from the following reaction?

Accepted Answer

The answer of Provide the structures of the constitutional isomers...

Question 18

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

Accepted Answer

The answer of Consider the reaction below to answer the...

Question 19

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

Accepted Answer

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

Question 20

Which of the following terms describes the mechanism for the addition of Br2 to butadiene?

Accepted Answer

A)   electrophilic addition
B)   nucleophilic addition
C)   pericyclic addition
D)   conjugate additionE) All of the above
F) None of the above

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

What is the systematic IUPAC name of the following compound?

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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.

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

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

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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 electrophile in this reaction is ____.

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Identify the product of the given reaction. ​

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

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Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the most exothermic reaction with H2 in the presence of a catalyst). Provide a brief explanation for your choice ?

Correct Answerverified1,4-Cyclohexadiene has a great...View AnswerShow 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

Sigmatropic shifts, cycloaddition reactions and anuulation reactions are all examples of pericyclic reactions.

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Which of the following terms describes the mechanism for the addition of Br2 to butadiene?

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

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

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

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Provide the structures of the constitutional isomers of the two major organic products obtained from the following reaction?

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Why carbonyl groups of aldehydes and ketones on conjugation with carbon-carbon double bonds show strong absorption in the ultraviolet spectrum?

Correct AnswerverifiedThe presence of conjugation in aldehydes...View AnswerShow Answer

Which of the following reaction coordinate diagrams explains the formation of different thermodynamic (T) and kinetic products from the same reactants (R) ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

For a diene to undergo a Diels-Alder reaction it must be able to adopt an s-trans conformation.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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Identify the product of the given reaction.

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Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the most exothermic reaction with H₂ in the presence of a catalyst). Provide a brief explanation for your choice ?

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1,4-Cyclohexadiene has a great...
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Which of the following terms describes the mechanism for the addition of Br₂ to butadiene?

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

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The presence of conjugation in aldehydes...
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