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Chapter 7: Delocalized Electrons and their Effect on Stability, Reactivity, and p
K
a
- Ultraviolet and Visible Spectroscopy
Quizzes
Quiz 2
Quiz 2
This activity contains 13 questions.
Which of the following is
not
a contributing resonance structure for CH
2
=CH-CH=CH-
.
CH
2
?
.
CH
2
-
-
CH-CH=CH-
+
CH
2
.
CH
2
-CH=CH-CH=CH
2
CH
2
=CH-
.
CH-CH=CH
2
.
CH
2
-
.
CH-
.
CH-CH=CH
2
How many different products could be obtained in the reaction of CH
2
=CH-CH=CH-CH
2
+
-CH
3
with a bromide ion?
1
2
3
4
Which of the following compounds is the most stable?
2,4-hexadiene
2,4-dimethyl-2,4-hexadiene
3-methyl-2,4-hexadiene
2,3,5-trimethyl-2,4-hexadiene
2,3,4,5-tetramethyl-1,4-hexadiene
What carbon is protonated in the first step of the reaction of 3-methyl-2,4-heptadiene with one equiv of HBr?
C-1
C-2
C-3
C-4
C-5
What kind of reactions do dienes most commonly undergo?
nucleophilic addition reactions
electrophilic substitution reactions
electrophilic addition reactions
nucleophilic substitution reactions
Which statement describes how a UV/Vis spectrum is affected by increasing the number of conjugated double bonds in a compound?
The lambda max increases and the molar absorptivity decreases.
The lambda max decreases and the molar adsorptivity increases.
The lambda max increases and the molar adsorptivity stays the same.
The lambda max stays the same and the molar absorptivity increases.
Both the lambda max and the molar absorptivity increase.
Which of the following compounds is the most stable?
1,2-dimethyl-1,4-cyclohexadiene
3,4-dimethyl-1,4-cyclohexadiene
1,3-dimethyl-1,4-cyclohexadiene
3,6-dimethyl-1,4-cyclohexadiene
Which of the following compounds has the UV spectrum with the greatest lambda max?
1,3,5-heptatriene
1-heptene
1,5-heptadiene
1,3,6-heptatriene
1,3-heptadiene
Which of the following is
not
a rule for drawing resonance contributors?
Pi electrons can move toward a nonbonding electron pair.
Nonbonding electrons can move toward a pi bond.
The total number of unpaired electrons cannot change.
Pi electrons can move toward a positive charge.
Only electrons can move, not atoms.
Which of the following would be most reactive toward electrophilic addition of HBr?
CH
2
=CH-CH
2
-CH
3
CH
2
=CH-CH
2
-O-CH
3
CH
2
=CH-CH(CH
3
)
2
CH
2
=CH-CH
3
CH
2
=CH-O-CH
3
How many resonance contributors does the anilinium ion, C
6
H
5
-(+)NH
3
, have?
2
3
4
5
6
Which of the following is the most stable resonance contributor of N
2
O?
(-)N=(+)N=O
N-N(+)—O(-)
(2-)N=(2+)N=O
N-N=O
Which compound contains the oxygen atom with the greatest electron density?
CH
3
-C(=O)-CH=CH
2
CH
3
-C(=O)-CH
3
CH
3
-C(=O)-CH
2
CH=CH
2
H-C(=O)-CH
3
H-C(=O)-H
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