Question 1

Identify the color of a compound that absorbs blue light.

Accepted Answer

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

Question 2

Predict the major product for the following reaction.

Accepted Answer

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

Question 3

What is the IUPAC name for the following compound?

Accepted Answer

A)   1-chloro-1-methyl-2,5-cyclohexadiene
B)   3-chloro-3-methyl-1,4-cyclohexadiene
C)   6-chloro-6-methyl-1,4-cyclohexadiene
D)   2-chloro-2-methyl-1,3-cyclohexadiene
E)   None of these

Question 4

Provide the structure for 1,2 addition product for the following reaction and explain why it is a major product rather than 1,4 addition product.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> This reaction is under thermodynamic co...

Question 5

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

Question 6

How many electrons does the HOMO of 1,3-pentadiene have in its excited state?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   none

Question 7

Dienes with alternate  π\piπ  and  σ\sigmaσ  bonds are classified as ______.

Accepted Answer

A)   isolated
B)   cumulated
C)   skipped
D)   conjugated
E)   none of these  D

Question 8

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

Question 9

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

Accepted Answer

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

Question 10

Use Woodward-Fieser rules to estimate the  λ\lambdaλ max for the following compound. max for the following compound.   A)  238 nm B)  233 nm C)  222 nm D)  229 nm E)  none of these " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   238 nm
B)   233 nm
C)   222 nm
D)   229 nm
E)   none of these

Question 11

Rank the following dienes in increasing order of stability (least to most) .

Accepted Answer

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

Question 12

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

Accepted Answer

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

Question 13

The following Diels-Alder reaction product is an intermediate in the synthesis of estrone. Provide the structure of the product.

Accepted Answer

The answer of The following Diels-Alder reaction product is an...

Question 14

Provide the structures of A, B and C for the following reaction sequence.

Accepted Answer

The answer of Provide the structures of A, B and...

Question 15

Absorption of UV-visible radiation by a molecule results in___________ transitions.

Accepted Answer

A)   electronic
B)   nuclear
C)   rotational
D)   vibrational
E)   None of these

Question 16

Which statement is NOT true about the Diels-Alder reaction?

Accepted Answer

A)   It is a [4+2] cycloaddition reaction.
B)   The diene must be in the s-cis conformation to react.
C)   Most Diels-Alder reactions are reversible.
D)   It is a sigmatropic rearrangement.
E)   Electron donating groups on the diene and electron withdrawing groups on the dienophile favor product formation.

Question 17

Predict the product for the following Diels-Alder reaction.

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   none of these

Question 18

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 19

Which one of the following represents the LUMO of 1,3,5-hexatriene?

Accepted Answer

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

Question 20

Predict the major product for the following reaction.

Accepted Answer

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

Exam 17: Conjugated Pi Systems and Pericyclic Reactions

Identify the color of a compound that absorbs blue light.

Correct AnswerverifiedShow Answer

Predict the major product for the following reaction.

Correct AnswerverifiedShow Answer

What is the IUPAC name for the following compound?

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Provide the structure for 1,2 addition product for the following reaction and explain why it is a major product rather than 1,4 addition product.

Correct Answerverified This reaction is under thermodynamic co...View AnswerShow Answer

What is the correct classification of the following pericyclic reaction?

Correct AnswerverifiedShow Answer

How many electrons does the HOMO of 1,3-pentadiene have in its excited state?

Correct AnswerverifiedShow Answer

Dienes with alternate π\piπ and σ\sigmaσ bonds are classified as ______.

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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

Correct Answerverified11eab459_a5dd_3d3b_acdb_1db137c705f8_TB3185_00

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

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Rank the following dienes in increasing order of stability (least to most) .

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

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The following Diels-Alder reaction product is an intermediate in the synthesis of estrone. Provide the structure of the product.

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Provide the structures of A, B and C for the following reaction sequence.

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Absorption of UV-visible radiation by a molecule results in___________ transitions.

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Which statement is NOT true about the Diels-Alder reaction?

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Predict the product for the following Diels-Alder reaction.

Correct AnswerverifiedShow Answer

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

Correct Answerverified11eab459_a5cc_e937_acdb_4576edec1648_TB3185_00

Which one of the following represents the LUMO of 1,3,5-hexatriene?

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Predict the major product for the following reaction.

Correct AnswerverifiedShow Answer

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This reaction is under thermodynamic co...
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Dienes with alternate $\pi$ and $\sigma$ bonds are classified as ______.

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Use Woodward-Fieser rules to estimate the $\lambda$ _max for the following compound. $Use Woodward-Fieser rules to estimate the \lambda <sub>max</sub> for the following compound. A) 238 nm B) 233 nm C) 222 nm D) 229 nm E) none of these$

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

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11eab459_a5cc_e937_acdb_4576edec1648_TB3185_00

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