Which alkene would you expect to be most stable a ch

35) Which alkene would you expect to be most stable?
a) CH
2
=CHCH
2
CH
2
CH=CH
2
b)
c)
d)
e)
Answer: E
C C
H
CH
3
H
CHCH
2
CH
2
H
CH
3
H
H
H
CH
3
CH
3
H H
H
H
CH
3
H CH
3
CH
3
H
H
H
CH
3
H
H
CH
3
CH
3
H
CH
3
H
I
II
III
IV
V
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C C
CH
3
CH
2
CH
H H
CH
2
C C
C
H H
CH
3
C
H
CH
3
H
C C
CH
3
H C
H
C
H
H
CH
3
Topic: Stability (Alkenes, Cations, Radicals)
Section: 13.7
Difficulty Level: Medium
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36) Arrange these hexadienes in order of expected decreasing stability.
a) V > II > I > III > IV
b) III > IV > II > I > V
c) IV > III > II > V > I
d) IV > III > I > II > V
e) I > II > IV > III > V
I II
IV V
III
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Topic: Stability (Alkenes, Cations, Radicals)
Section: 13.7
Difficulty Level: Medium
37) Arrange these hexadienes in order of expected increasing stability.
a) V < II < I < III < IV
b) III < IV < II < I < V
c) IV < III < II < V < I
d) IV < III < I < II < V
e) I < II < IV < III < V
I II
IV V
III
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Topic: Stability (Alkenes, Cations, Radicals)
Section: 13.7
Difficulty Level: Medium
38) Arrange these carbocations in order of expected increasing stability.
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I
II III
IV V
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Topic: Stability (Alkenes, Cations, Radicals)
Section: 13.3
Difficulty Level: Medium
39) Arrange these carbocations in order of expected increasing stability.
I II
III
IV V
a) V < II < I < IV < III
b) V<I<II<IV<III
c) IV <I< II <V< III
d) IV < III < I < II < V
e) II < III < IV < V < I
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Topic: Stability (Alkenes, Cations, Radicals)
Section: 13.3
Difficulty Level: Medium
40) Which is not an example of resonance?
I
III
IV
II
CH
2
CH
2
CH
2
=CH ± CH
2
CH
2
=CH ± CH ± CH
2
CCl
3
CH
2
CH
3
CH
2
± CH=CH
2
CH
2
± CH=CH ± CH
2
CCl
3
. .
+
+
+
.
.
17
Topic: Resonance
Section: 13.4
Difficulty Level: Easy
41) Which is not an example of resonance?
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Topic: Resonance
Section: 13.4
Difficulty Level: Easy
42) Which is not a proper resonance structure for 1,3-butadiene?
a) CH
2
=CH–CH=CH
2
b)
c)
d)
e) All of these answer choices are correct.
Answer: B
CH CH
2
CH CH
2
CH CH
2
CH CH
2
CH CH
2
CH CH
2
Topic: Resonance
Section: 13.4
Difficulty Level: Easy
43) Which pair does not represent a pair of resonance structures?

19
a) I
b) II
c) III
d) IV
e) All of these choices represent pairs of resonance structures.
Answer: D
Topic: Resonance
Section: 13.4
Difficulty Level: Easy