Question 1

What is the IUPAC name for the following compound?

Accepted Answer

A)  (2E,4Z,6
E) -3,4,7,8-tetramethyl-2,4,6-heptatriene 
B)  (2Z,4
E) -3,4,7-trimethyl-2,4,6-octatriene 
C)  (2E,4Z,6
E) -2,5,6,7-tetramethyl-3,5,7-heptatriene 
D)  (2E,4Z)- 2,5,6-trimethyl-3,5,7-octatriene 
E)  (4E,6
E) -2,5,6-trimethyl-2,4,6-octatriene 
A)  (2E,4Z,6
E) -3,4,7,8-tetramethyl-2,4,6-heptatriene 
B)  (2Z,4
E) -3,4,7-trimethyl-2,4,6-octatriene 
C)  (2E,4Z,6
E) -2,5,6,7-tetramethyl-3,5,7-heptatriene 
D)  (2E,4Z)- 2,5,6-trimethyl-3,5,7-octatriene 
E)  (4E,6
E) -2,5,6-trimethyl-2,4,6-octatriene

Question 2

Which one of the following compounds is not a product of reaction between 1,3-butadiene and HBr?

Accepted Answer

A)  (S)-3-bromo-1-butene 
B)  (R)-3-bromo-1-butene 
C)  (
E) -1-bromo-2-butene 
D)  (Z)-1-bromo-2-butene 
E)  (Z)-2-bromo-2-butene 
A)  (S)-3-bromo-1-butene 
B)  (R)-3-bromo-1-butene 
C)  (
E) -1-bromo-2-butene 
D)  (Z)-1-bromo-2-butene 
E)  (Z)-2-bromo-2-butene

Question 3

Predict the product for the following reaction.

Accepted Answer

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

Question 4

A reaction under kinetic control will yield :

Accepted Answer

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

Question 5

Which of the following is true of pericyclic reactions?

Accepted Answer

A)  they are concerted reactions 
B)  proceed via a cyclic transition state 
C)  no intermediates are formed 
D)  all of these 
A)  they are concerted reactions 
B)  proceed via a cyclic transition state 
C)  no intermediates are formed 
D)  all of these

Question 6

Predict the product for the following reaction and provide the curved arrow mechanism for formation of the product.

Accepted Answer

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

Question 7

Use Woodward-Fieser rules to estimate the $\lambda$max for the following compound.

Accepted Answer

The answer of Use Woodward-Fieser rules to estimate the $\lambda$max...

Question 8

Which of the following compounds is (are) a isolated diene(s)?

Accepted Answer

A)  4-methyl-1,3-heptadiene 
B)  3-methyl-1,5-heptadiene 
C)  2-methyl-2,4-heptadiene 
D)  4-methyl-1,4-heptadiene 
E)  5-methyl-2,3-heptadiene 
A)  4-methyl-1,3-heptadiene 
B)  3-methyl-1,5-heptadiene 
C)  2-methyl-2,4-heptadiene 
D)  4-methyl-1,4-heptadiene 
E)  5-methyl-2,3-heptadiene

Question 9

Predict the product(s) for the following reaction.

Accepted Answer

The answer of Predict the product(s) for the following reaction....

Question 10

Which of the following compounds is (are) a conjugated diene(s)?

Accepted Answer

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

Question 11

Predict the product for the following Diels-Alder reaction.

Accepted Answer

The answer of Predict the product for the following Diels-Alder...

Question 12

Which one of the following represents the lowest energy  $\pi$-bonding 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 13

Predict the major product for the following intramolecular Diels-Alder reaction and provide a curved arrow mechanism for the formation of the product.

Accepted Answer

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

Question 14

How many electrons does the HOMO of 2,4-hexadiene have in its ground state?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  0 
A)  1 
B)  2 
C)  3 
D)  4 
E)  0

Question 15

Which of the following compounds have isolated double bonds?

Accepted Answer

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

Question 16

Which of the following diene(s) cannot undergo the Diels-Alder reaction?

Accepted Answer

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

Question 17

Predict the product for the following reaction.

Accepted Answer

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

Question 18

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 19

Which one of the following dienes is most stable?

Accepted Answer

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

Question 20

Predict the product for the following Cope rearrangement and provide the curved arrow mechanism for formation of the product.

Accepted Answer

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

Exam 17: Conjugated Pi Systems and Pericyclic Reactions

What is the IUPAC name for the following compound?

Which one of the following compounds is not a product of reaction between 1,3-butadiene and HBr?

Predict the product for the following reaction.

A reaction under kinetic control will yield :

Which of the following is true of pericyclic reactions?

Predict the product for the following reaction and provide the curved arrow mechanism for formation of the product.

Use Woodward-Fieser rules to estimate the λ\lambdaλ max for the following compound.

Which of the following compounds is (are) a isolated diene(s)?

Predict the product(s) for the following reaction.

Which of the following compounds is (are) a conjugated diene(s)?

Predict the product for the following Diels-Alder reaction.

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

Predict the major product for the following intramolecular Diels-Alder reaction and provide a curved arrow mechanism for the formation of the product.

How many electrons does the HOMO of 2,4-hexadiene have in its ground state?

Which of the following compounds have isolated double bonds?

Which of the following diene(s) cannot undergo the Diels-Alder reaction?

Predict the product for the following reaction.

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

Which one of the following dienes is most stable?

Predict the product for the following Cope rearrangement and provide the curved arrow mechanism for formation of the product.

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

Filters

Use Woodward-Fieser rules to estimate the $\lambda$ _max for the following compound. $Use Woodward-Fieser rules to estimate the \lambda <sub>max</sub> for the following compound.$

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