CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC REACTIONS
CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC REACTIONS
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CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC REACTIONS
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CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC REACTIONS
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CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC REACTIONS
CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC
REACTIONS
MULTIPLE CHOICE
1. Which of the following are conjugated dienes?
a. only 1
b. only 2
c. only 1 and 2
d. 1, 2 and 3
ANS: C
2. Which of the following are conjugated dienes?
a. only 1
b. only 2
c. only 1 and 2
d. 1, 2 and 3...
and pericyclic reactions multiple choice 1 which of the following are conjugated dienes a only
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CHAPTER 20—DIENES, CONJUGATED SYSTEMS, AND PERICYCLIC
REACTIONS
MULTIPLE CHOICE
1. Which of the following are conjugated dienes?
a. only 1
b. only 2
c. only 1 and 2
d. 1, 2 and 3
ANS: C
2. Which of the following are conjugated dienes?
a. only 1
b. only 2
c. only 1 and 2
d. 1, 2 and 3
ANS: B
3. What is the IUPAC name of the following compound?
a. 2,3-dimethyl-2,4-pentadiene
b. (Z)-2,3-dimethyl-2,4-pentadiene
c. 3,4-dimethyl-1,3-pentadiene
d. (Z)-3,4-dimethyl-1,3-pentadiene
ANS: C
BIAF 7e Test Bank
,4. What is the IUPAC name of the following compound?
a. (R)-3-vinyl-1-butene
b. 3-methyl-1,5-pentadiene
c. 3-methyl-1,4-pentadiene
d. (R)-3-methyl-1,4-pentadiene
ANS: C
5. What is the systematic IUPAC name of the following compound?
a. (3S,4E)-3-ethyl-3,4-dimethyl-1,4-hexadiene
b. (3R,4E)-3-ethyl-3,4-dimethyl-1,4-hexadiene
c. (3S,4Z)-3-ethyl-3,4-dimethyl-1,4-hexadiene
d. (3R,4Z)-3-ethyl-3,4-dimethyl-1,4-hexadiene
ANS: A
6. Which of the following alkenes undergoes the least exothermic hydrogenation upon treatment with
H2/Pd
a. 1
b. 2
c. 3
d. 4
ANS: C
7. What is the correct order of exothermicity for hydrogenation of the following hexadienes upon
treatment with H2/Pd (more exothermic > less exothermic)?
BIAF 7e Test Bank
, a. 1>2>3
b. 3>1>2
c. 2>1>3
d. 3>2>1
ANS: B
8. Which of the following arrangements of p atomic orbitals gives the lowest energy -bonding
molecular orbital of 1,3-butadiene?
a. 1
b. 2
c. 3
d. 4
ANS: B
9. Which of the following arrangements of p atomic orbitals gives the highest energy -antibonding
molecular orbital of 1,3-butadiene?
a. 1
b. 2
c. 3
d. 4
ANS: C
10. Which of the following arrangements of p atomic orbitals of 1,3-butadiene has the greatest number of
nodes?
a. 1
b. 2
c. 3
d. 4
ANS: C
BIAF 7e Test Bank
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