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)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 2

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

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 3

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

Question 4

Identify the product of the given reaction. ​

Accepted Answer

A)  I 
B)  II 
C)  IV 
D)  III 
A)  I 
B)  II 
C)  IV 
D)  III

Question 5

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 quantity 
A)  M−1⋅cm−1 
B)  M⋅cm 
C)  J⋅mol−1⋅M−1 
D)  none, ε is a dimensionless quantity

Question 6

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 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 flip 
A)  bond vibration 
B)  electron excitation 
C)  nuclear spin flip 
D)  electron spin flip

Question 8

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 9

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)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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-butene 
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-butene

Question 12

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-hexadiene 
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-hexadiene

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

Question 14

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 15

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 16

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 17

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 18

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 addition 
A)  electrophilic addition 
B)  nucleophilic addition 
C)  pericyclic addition 
D)  conjugate addition

Question 19

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 20

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

Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

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

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

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

Identify the product of the given reaction. ​

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

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.

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

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

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

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

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

What is the systematic IUPAC name of the following compound?

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

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

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

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 ____.

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 ____.

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

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

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 ?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

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

Identify the product of the given reaction.

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

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 ?