Question 1

Predict the product for the following reaction.

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

Predict the product for the following reaction.

Accepted Answer

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

Question 4

Identify the cumulated diene.

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 5

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

@#IMG-DLM&_TB4454_00

Question 6

Identify the products of a reaction under kinetic control.

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 7

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

Accepted Answer

A)  disrotatory, cis-5,6-diethyl-1,3-cyclohexadiene 
B)  conrotatory, cis-5,6-diethyl-1,3-cyclohexadiene 
C)  disrotatory, trans-5,6-diethyl-1,3-cyclohexadiene 
D)  conrotatory, trans -5,6-diethyl-1,3-cyclohexadiene 
A)  disrotatory, cis-5,6-diethyl-1,3-cyclohexadiene 
B)  conrotatory, cis-5,6-diethyl-1,3-cyclohexadiene 
C)  disrotatory, trans-5,6-diethyl-1,3-cyclohexadiene 
D)  conrotatory, trans -5,6-diethyl-1,3-cyclohexadiene

Question 8

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 9

Rank the following dienes in order of decreasing heat of hydrogenation (highest to lowest).

Accepted Answer

The answer of Rank the following dienes in order of...

Question 10

Zingiberene, a terpene found in ginger, has the following structure. Classify the $\pi$bonds in zingiberene as conjugated, cumulated or isolated.

Accepted Answer

The answer of Zingiberene, a terpene found in ginger, has...

Question 11

Identify the color of a compound that absorbs blue light.

Accepted Answer

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

Question 12

Predict the major product for the following reaction.

Accepted Answer

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

Question 13

Provide the structure of the 1,2 addition product for the following reaction.

Accepted Answer

The answer of Provide the structure of the 1,2 addition...

Question 14

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 15

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

Accepted Answer

The answer of Which diene and dienophile would react to...

Question 16

The reaction of 1,3-butadiene with hydrogen halide at 40°C will undergo _____ -addition under ____________ control.

Accepted Answer

The answer of The reaction of 1,3-butadiene with hydrogen halide...

Question 17

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 18

Predict the product(s) for the following reaction.

Accepted Answer

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

Question 19

Which of the following compounds has the longest $\lambda$max?

Accepted Answer

A)  (E )-2-pentene 
B)  (Z)-2-pentene 
C)  1-pentene 
D)  1,3-hexadiene 
E)  1,3,5-hexatriene 
A)  (E )-2-pentene 
B)  (Z)-2-pentene 
C)  1-pentene 
D)  1,3-hexadiene 
E)  1,3,5-hexatriene

Question 20

Identify the pericyclic reaction in which no sigma bonds are formed and no pi bonds are broken.

Accepted Answer

A)  sigmatropic rearrangement 
B)  cycloaddition reaction 
C)  electrolytic reaction 
D)  this is not a pericyclic reaction 
A)  sigmatropic rearrangement 
B)  cycloaddition reaction 
C)  electrolytic reaction 
D)  this is not a pericyclic reaction

Exam 16: Conjugated Pi Systems and Pericyclic Reactions

Predict the product for the following reaction.

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

Predict the product for the following reaction.

Identify the cumulated diene.

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

Identify the products of a reaction under kinetic control.

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

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

Rank the following dienes in order of decreasing heat of hydrogenation (highest to lowest).

Zingiberene, a terpene found in ginger, has the following structure. Classify the π\piπ bonds in zingiberene as conjugated, cumulated or isolated.

Identify the color of a compound that absorbs blue light.

Predict the major product for the following reaction.

Provide the structure of the 1,2 addition product for the following reaction.

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

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

The reaction of 1,3-butadiene with hydrogen halide at 40°C will undergo _____ -addition under ____________ control.

Which of the following is true of pericyclic reactions?

Predict the product(s) for the following reaction.

Which of the following compounds has the longest λ\lambdaλ max?

Identify the pericyclic reaction in which no sigma bonds are formed and no pi bonds are broken.

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

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and 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

Introduction to Organometallic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

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

Zingiberene, a terpene found in ginger, has the following structure. Classify the $\pi$ bonds in zingiberene as conjugated, cumulated or isolated. $Zingiberene, a terpene found in ginger, has the following structure. Classify the \pi bonds in zingiberene as conjugated, cumulated or isolated.$

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

The reaction of 1,3-butadiene with hydrogen halide at 40°C will undergo _ -addition under ________ control.

Which of the following compounds has the longest $\lambda$ _max?