Question 1

Which of the following best describes the stereochemistry of ring closure and the product for the following reaction?

Accepted Answer

A)  disrotatory, cis-3,4-diethylcyclobutene 
B)  conrotatory, cis-3,4-diethylcyclobutene 
C)  disrotatory, trans-3,4-diethylcyclobutene 
D)  conrotatory, trans-3,4-diethylcyclobutene 
A)  disrotatory, cis-3,4-diethylcyclobutene 
B)  conrotatory, cis-3,4-diethylcyclobutene 
C)  disrotatory, trans-3,4-diethylcyclobutene 
D)  conrotatory, trans-3,4-diethylcyclobutene

Question 2

Identify the color of a compound that absorbs yellow light.

Accepted Answer

A)  orange 
B)  green 
C)  red 
D)  blue 
E)  violet 
A)  orange 
B)  green 
C)  red 
D)  blue 
E)  violet

Question 3

A thermodynamically-controlled reaction will yield :

Accepted Answer

A)  the most stable product. 
B)  the product whose formation requires the smallest free energy of activation. 
C)  the product that can be formed in the fewest steps. 
D)  the product that is formed at the fastest rate. 
E)  None of these. 
A)  the most stable product. 
B)  the product whose formation requires the smallest free energy of activation. 
C)  the product that can be formed in the fewest steps. 
D)  the product that is formed at the fastest rate. 
E)  None of these.

Question 4

Which of the following compounds have conjugated double bonds?

Accepted Answer

The answer of Which of the following compounds have conjugated...

Question 5

Which one of the following dienophiles is most reactive in the Diels-Alder reaction?

Accepted Answer

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

Question 6

Predict the possible major products for the following reaction.

Accepted Answer

The answer of Predict the possible major products for the...

Question 7

Predict the major product for the following reaction and explain why it is major product.

Accepted Answer

@#IMG-DLM& This reaction is under thermodynamic co

Question 8

Predict the major product for the following Diels-Alder reaction.

Accepted Answer

The answer of Predict the major product for the following...

Question 9

Predict the product for the following reaction.

Accepted Answer

The answer of Predict the product for the following reaction....

Question 10

Which of the following compounds is an isolated diene?

Accepted Answer

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

Question 11

Provide the reagents necessary to carry out the following conversion.

Accepted Answer

The answer of Provide the reagents necessary to carry out...

Question 12

Which diene and dienophile would react to give the following Diels-Alder product?

Accepted Answer

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

Question 13

Compound A is one of the intermediate products in the synthesis of the corticoid hormone cortisone. Provide the structure of compound A.

Accepted Answer

The answer of Compound A is one of the intermediate...

Question 14

Predict the major product for the following Diels-Alder reaction.

Accepted Answer

The answer of Predict the major product for the following...

Question 15

What is the correct classification of the following pericyclic reaction?

Accepted Answer

A)  electrophilic addition 
B)  sigmatropic rearrangement 
C)  cycloaddition 
D)  electrocyclic reaction 
E)  C & D 
A)  electrophilic addition 
B)  sigmatropic rearrangement 
C)  cycloaddition 
D)  electrocyclic reaction 
E)  C & D

Question 16

Predict the major product for the following Diels-Alder reaction.

Accepted Answer

The answer of Predict the major product for the following...

Question 17

Which one of the following represents the highest energy  $\pi$-antibonding molecular orbital of 1,3-butadiene?

Accepted Answer

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

Question 18

Which one of the following dienes is most stable?

Accepted Answer

A)  CH3CH=CHCH=CHCH3 
B)  CH3CH=CHCH2CH=CH2 
C)  CH2=CHCH2CH2CH=CH2 
D)  CH2=CHCH(CH3)CH=CH2 
E)  CH3CH=C=CHCH2CH3 
A)  CH3CH=CHCH=CHCH3 
B)  CH3CH=CHCH2CH=CH2 
C)  CH2=CHCH2CH2CH=CH2 
D)  CH2=CHCH(CH3)CH=CH2 
E)  CH3CH=C=CHCH2CH3

Question 19

Provide the structure for (S,E)-3-t-butyl-4-methyl-1,4-hexadiene.

Accepted Answer

The answer of Provide the structure for (S,E)-3-t-butyl-4-methyl-1,4-hexadiene....

Question 20

What is the correct classification of the following pericyclic reaction?

Accepted Answer

A)  electrophilic addition 
B)  sigmatropic rearrangement 
C)  cycloaddition 
D)  electrocyclic reaction 
E)  C & D 
A)  electrophilic addition 
B)  sigmatropic rearrangement 
C)  cycloaddition 
D)  electrocyclic reaction 
E)  C & D

Exam 17: Conjugated Pi Systems and Pericyclic Reactions

Which of the following best describes the stereochemistry of ring closure and the product for the following reaction?

Identify the color of a compound that absorbs yellow light.

A thermodynamically-controlled reaction will yield :

Which of the following compounds have conjugated double bonds?

Which one of the following dienophiles is most reactive in the Diels-Alder reaction?

Predict the possible major products for the following reaction.

Predict the major product for the following reaction and explain why it is major product.

Predict the major product for the following Diels-Alder reaction.

Predict the product for the following reaction.

Which of the following compounds is an isolated diene?

Provide the reagents necessary to carry out the following conversion.

Which diene and dienophile would react to give the following Diels-Alder product?

Compound A is one of the intermediate products in the synthesis of the corticoid hormone cortisone. Provide the structure of compound A.

Predict the major product for the following Diels-Alder reaction.

What is the correct classification of the following pericyclic reaction?

Predict the major product for the following Diels-Alder reaction.

Which one of the following represents the highest energy π\piπ -antibonding molecular orbital of 1,3-butadiene?

Which one of the following dienes is most stable?

Provide the structure for (S,E)-3-t-butyl-4-methyl-1,4-hexadiene.

What is the correct classification of the following pericyclic reaction?

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Substitution Reactions

Alkenes: Structure and Preparation Via Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

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Which one of the following represents the highest energy $\pi$ -antibonding molecular orbital of 1,3-butadiene? $Which one of the following represents the highest energy \pi -antibonding molecular orbital of 1,3-butadiene?$