III. Stability by Hyperconjugation: Alkenes and Carbocations. Determine the number of canonical structures for each. А. Alkenes CH3 ÇH3 1. CH3-CH—сH-CH-CH2CH2-СH3 ÇH3 C-CH-CH3 CH3 3. CH3-C: Answers: 1. 2. CH3 ÇH3 2. Hас—с—сH-CH-CH—CH3 CH3 3. 4. ÇH3 CH3-CH2-C= 4. -CH2CH3 CH3 B. Carbocations ÇH3 CH3 CH3-CH2-CH- ÇH3 H2c-CH-CH-CH-CH-CH3 CH3 -CH2CH3 3. 1. Answers: CH3 1. 2. 3. CH3 4. 2. CH3-HC- -CH2-CH-CH2CH2-CH3 4. CH3-CH-C-CH-CH3 CH3

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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III. Stability by Hyperconjugation: Alkenes and Carbocations. Determine the number
of canonical structures for each.
А. Alkenes
ÇH3
3. CH3-C:
CH-CH3
Answers:
1.
2.
3.
1. СН3-CH—CH-CH-CH2CH2-CHз
ČH3
ÇH3
ÇH3
-CH-ÇH-CH-CH3
CH3
CH3
CH3-CH2-Ć=
4.
2. H2С-
:C-
4.
-CH2CH3
CH3
B. Carbocations
ÇH3
ÇH3
H2c-CH-CH-ÇH-CH-CH3
CH3
CH3-CH2-CH-
C-
-CH2CH3
3.
1.
Answers:
CH3
1.
2.
3.
ÇH3
CH3-CH-C-CH-CH3
ČH3
4.
2. CH3-HC-CH2-CH-CH2CH2-CH3
4.
Transcribed Image Text:III. Stability by Hyperconjugation: Alkenes and Carbocations. Determine the number of canonical structures for each. А. Alkenes ÇH3 3. CH3-C: CH-CH3 Answers: 1. 2. 3. 1. СН3-CH—CH-CH-CH2CH2-CHз ČH3 ÇH3 ÇH3 -CH-ÇH-CH-CH3 CH3 CH3 CH3-CH2-Ć= 4. 2. H2С- :C- 4. -CH2CH3 CH3 B. Carbocations ÇH3 ÇH3 H2c-CH-CH-ÇH-CH-CH3 CH3 CH3-CH2-CH- C- -CH2CH3 3. 1. Answers: CH3 1. 2. 3. ÇH3 CH3-CH-C-CH-CH3 ČH3 4. 2. CH3-HC-CH2-CH-CH2CH2-CH3 4.
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