80.
What diene and dienophile would react to give the following Diels-Alder product?
O
O
81.
What diene and dienophile would react to give the following Diels-Alder product?
O
COCH3
H
O
82.
What diene and dienophile would react to give the following Diels-Alder product?
O
O
83.
What diene and dienophile would react to give the following Diels-Alder product?
O
O
O
84.
What diene and dienophile would react to give the following Diels-Alder product?
O2N
85.
The following product is formed by an intramolecular Diels-Alder reaction. Provide the
structure of the starting compound.
O
86.
What diene and dienophile would react to give the following Diels-Alder product?
O
87.
What diene and dienophile would react to give the following Diels-Alder product?
O
CN
88.
Which of the following best describes the stereochemistry of ring closure and the
product for the following reaction?
A)
disrotatory, cis-3,4-diethylcyclobutene
B)
conrotatory, cis-3,4-diethylcyclobutene
C)
disrotatory, trans-3,4-diethylcyclobutene
D)
conrotatory, trans-3,4-diethylcyclobutene
89.
Which of the following best describes the stereochemistry of ring closure and the
product for the following reaction?
h
A)
disrotatory, cis-3,4-diethylcyclobutene
B)
conrotatory, cis-3,4-diethylcyclobutene
C)
disrotatory, trans-3,4-diethylcyclobutene
D)
conrotatory, trans -3,4-diethylcyclobutene
Ans:
A
90.
Which of the following best describes the stereochemistry of ring closure and the
product for the following reaction?
h
(3E,5Z,7E)-3,5,7-decatriene
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
Ans:
D
Ans:
D
91.
Which of the following best describes the stereochemistry of ring closure and the
product for the following reaction?
(3E,5Z,7E)-3,5,7-decatriene
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
92.
Predict the product for the following electrocyclic reaction.
h
Ans:
A
93.
Predict the product for the following electrocyclic reaction.
h
94.
Predict the product for the following electrocyclic reaction.
95.
Predict the product for the following Claisen rearrangement.
O
OH OH OH
III III
OH
IV
A)
I
B)
II
C)
III
D)
IV
96.
Predict the product for the following Cope rearrangement.
III III
IV
A)
I
B)
II
C)
III
D)
IV
Ans:
C
Ans:
D
97.
Predict the product for the following reaction.
OH
98.
Predict the product for the following Claisen rearrangement and provide the curved
arrow mechanism for formation of the product.
O
99.
Predict the product for the following Cope rearrangement and provide the curved arrow
mechanism for formation of the product.
100.
Predict the product for the following reaction and provide the curved arrow mechanism
for formation of the product.
O D
101.
Provide the structures of A, B and C for the following reaction sequence.
OH
1. NaOH
2. Br
AB1. NaOH
2. CH3CH2Br
C
102.
Absorption of UV-visible radiation by a molecule results in___________ transitions.
A)
electronic
B)
nuclear
C)
rotational
D)
vibrational
E)
None of these
Ans:
A
103.
Which is the most energetically favorable UV transition for 1,3-butadiene?.
A)
n ⎯⎯⎯→ *
B)
n ⎯⎯⎯→ *
C)
2 ⎯⎯⎯→ 3*
D)
⎯⎯⎯→ *
E)
1 ⎯⎯⎯→ 4*
Ans:
C
104.
Which of the following compound(s) have the longest max?
A)
(E) 2-pentene
B)
(Z) 2-pentene
C)
−pentene
D)
−hexadiene
E)
−hexatriene
105.
Which of the following compound(s) have the longest max?
I II III
IV V
A)
I
B)
II
C)
III
D)
IV
E)
V
Ans:
B
Ans:
E
106.
Which of the following compound(s) have the longest max?
CH=CHCH=CH2CH=CHCH=CH2CH=CHCH=CH2CH=CHCH=CH2CH=CHCH=CH2
III III IV V
A)
I
B)
II
C)
III
D)
IV
E)
V
Ans:
A