Question 1

Which of the following dienes would you expect to be the most stable?

Accepted Answer

A)   CH3CH=CHCH=CHCH3
B)   CH3CH=CHCH2CH=CH2
C)   CH2=CHCH2CH2CH=CH2
D)   CH2=CHCH(CH3) CH=CH2
E)   CH3CH=C=CHCH2CH3F) B) and C)
G) A) and D)

Question 2

The LUMO of 1,3-pentadiene has how many electrons in its excited state?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   0F) B) and C)
G) A) and D)

Question 3

How could the following synthesis be carried out? 2/CCl4; (2) CH3MgCl,ether; (3) CH3ONa/CH3OH B)  (1) HBr (1 eq) ; (2) (CH3) 2CuLi,ether C)  (1) HBr (1eq) ; (2) Li,ether; (3) CuI; (4) CH3Br D)  More than one of the above E)  All of the above" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   (1) Br2/CCl4; (2) CH3MgCl,ether; (3) CH3ONa/CH3OH
B)   (1) HBr (1 eq) ; (2) (CH3) 2CuLi,ether
C)   (1) HBr (1eq) ; (2) Li,ether; (3) CuI; (4) CH3Br
D)   More than one of the above
E)   All of the aboveF) A) and D)
G) A) and E)

Question 4

Which of the following dienes might react with bromine in CCl4 to yield 2,5-dibromo-3-hexene?

Accepted Answer

A)   CH2=CHCH2CH2CH=CH2
B)   CH2=CHCH=CHCH2CH3
C)   CH3CH=C=CHCH2CH3
D)   CH3CH=CHCH=CHCH3
E)   CH3CH=CHCH2CH=CH2F) A) and E)
G) A) and D)

Question 5

Which compound would have a UV absorption band at longest wavelength?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) A) and D)
G) C) and D)

Question 6

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

Accepted Answer

A)   the less stable product forms more rapidly.
B)   the more stable product forms more rapidly.
C)   product B will predominate at equilibrium.
D)   the intermediate has a short lifetime.
E)   No conclusions can be drawn as to either reaction rate or product stability.F) A) and B)
G) B) and D)

Exam 13: Conjugated Unsaturated Systems

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

Correct Answer
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Which compound would have a UV absorption band at longest wavelength?

Correct Answer
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The LUMO of 1,3-pentadiene has how many electrons in its excited state?

Correct Answer
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Which of the following dienes might react with bromine in CCl₄ to yield 2,5-dibromo-3-hexene?

Correct Answer
verified

Which of the following dienes would you expect to be the most stable?

Correct Answer
verified

How could the following synthesis be carried out?

Correct Answer
verified

Exam 13: Conjugated Unsaturated Systems

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

Correct AnswerverifiedShow Answer

Which compound would have a UV absorption band at longest wavelength?

Correct AnswerverifiedShow Answer

The LUMO of 1,3-pentadiene has how many electrons in its excited state?

Correct AnswerverifiedShow Answer

Which of the following dienes might react with bromine in CCl4 to yield 2,5-dibromo-3-hexene?

Correct AnswerverifiedShow Answer

Which of the following dienes would you expect to be the most stable?

Correct AnswerverifiedShow Answer

How could the following synthesis be carried out?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
verified

Which of the following dienes might react with bromine in CCl₄ to yield 2,5-dibromo-3-hexene?

Correct Answer
verified

Correct Answer
verified

Correct Answer
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