Question 1

Identify the color of a compound that absorbs blue light.

Accepted Answer

A)   orange
B)   green
C)   red
D)   blue
E)   yellowF) A) and B)
G) B) and D)

Question 2

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 3

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  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30">_TB4454_00...

Question 4

Predict the product(s)  for the following reaction.

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   both I & IIIF) D) and E)
G) All of the above

Question 5

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-cyclohexadieneE) None of the above
F) B) and C)

Question 6

Predict the product for the following reaction.

Accepted Answer

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

Question 7

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 theseF) B) and D)
G) All of the above

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

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 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

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 reactionE) A) and B)
F) None of the above

Question 12

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-heptadieneF) A) and B)
G) A) and C)

Question 13

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

Accepted Answer

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

Question 14

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 15

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 16

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 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 theseE) B) and C)
F) B) and D)

Question 18

Predict the product for the following reaction.

Accepted Answer

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

Question 19

Predict the major product for the following reaction.

Accepted Answer

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

Question 20

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...

Exam 16: Conjugated Pi Systems and Pericyclic Reactions

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

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Identify the products of a reaction under kinetic control.

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Identify the cumulated diene.

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

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Which of the following is true of pericyclic reactions?

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

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

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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.

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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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Identify the color of a compound that absorbs blue light.

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Predict the major product for the following reaction.

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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 has the longest λ\lambdaλ max?

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

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Predict the product(s) for the following reaction.

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

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

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

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Predict the product for the following reaction.

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_TB4454_00...
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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 of the following compounds has the longest $\lambda$ _max?

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

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

Correct Answer
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Correct Answer
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