Question 1

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

Question 2

Which of the following compounds have isolated double bonds?

Accepted Answer

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

Question 3

Predict the product for the following Diels-Alder reaction.

Accepted Answer

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

Question 4

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

Question 5

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

Question 6

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

Question 7

Which one of the following dienes is most stable?

Accepted Answer

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

Question 8

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

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

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 11

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 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

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 15

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

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

Question 17

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...

Question 18

Predict the product for the following reaction.

Accepted Answer

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

Question 19

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

Question 20

Predict the product for the following reaction.

Accepted Answer

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

Exam 17: Conjugated Pi Systems and Pericyclic Reactions

A reaction under kinetic control will yield :

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

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Which of the following is true of pericyclic reactions?

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

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Which of the following compounds have isolated double bonds?

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

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

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

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Predict the product(s) for the following reaction.

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Which one of the following dienes is most stable?

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

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

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Predict the product for the following Diels-Alder reaction.

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Predict the product for the following reaction.

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What is the IUPAC name for the following compound?

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

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

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

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

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Predict the product for the following reaction.

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

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Which one of the following represents the lowest energy $\pi$ -bonding molecular orbital of 1,3-butadiene? $Which one of the following represents the lowest energy \pi -bonding molecular orbital of 1,3-butadiene? A) I B) II C) III D) IV$

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