Textbook Question
Which species in each pair is more stable?
a.
3
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Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 86c,d
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 86c,dChapter 10, Problem 86c,d
Which species in each pair is more stable?
c. 
d. 
Verified step by step guidance1
Step 1: Analyze the stability of the first pair of species. The stability of a carbanion is influenced by factors such as inductive effects, resonance stabilization, and hyperconjugation. In the first pair, compare the carbanion on CH₂CH₂CH=CH₂ versus CH₃CHCH=CH₂.
Step 2: For the first pair, consider the inductive effect of the alkyl groups. Alkyl groups are electron-donating, which destabilizes a carbanion. The CH₃ group in CH₃CHCH=CH₂ will donate electrons via induction, making the carbanion less stable compared to CH₂CH₂CH=CH₂, which has no such electron-donating group.
Step 3: Analyze the stability of the second pair of species. The stability of alkenes is influenced by the degree of substitution on the double bond. More substituted alkenes are generally more stable due to hyperconjugation and inductive effects.
Step 4: For the second pair, compare the substitution on the double bond. CH₃CHCH=CH₂ has a double bond with three substituents (two CH₃ groups and one CH₂ group), while CH₃CH₂C=CH₂ has a double bond with two substituents (one CH₃ group and one CH₂ group). The greater substitution in CH₃CHCH=CH₂ makes it more stable.
Step 5: Summarize the findings: In the first pair, CH₂CH₂CH=CH₂ is more stable due to less destabilization from inductive effects. In the second pair, CH₃CHCH=CH₂ is more stable due to higher substitution on the double bond.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stability of Alkenes
The stability of alkenes is influenced by the degree of substitution at the double bond. More substituted alkenes are generally more stable due to hyperconjugation and the inductive effect, which help to distribute electron density. In the given pairs, analyzing the substitution pattern around the double bond is crucial for determining which species is more stable.
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Understanding trends of alkene stability.
Hyperconjugation
Hyperconjugation is a stabilizing interaction that occurs when the electrons in a sigma bond (usually C-H or C-C) interact with an adjacent empty or partially filled p-orbital or π-bond. This effect allows for the delocalization of electrons, which increases the stability of the molecule. In alkenes, more hyperconjugative interactions from adjacent alkyl groups lead to greater stability.
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Inductive Effect
The inductive effect refers to the electron-withdrawing or electron-donating effects of substituents through sigma bonds. Electronegative atoms or groups can pull electron density away from the double bond, affecting its stability. In evaluating the stability of the given species, considering the nature and position of substituents relative to the double bond is essential for understanding their influence on stability.
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Related Practice
Textbook Question
Which species in each pair is more stable?
f.
1
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Textbook Question
Which species in each pair is more stable?
b.
1
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Textbook Question
Indicate how each of the same factors affects an E2 reaction.
1. the strength of the base
2. the concentration of the base
3. the solvent
1
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Textbook Question
A chemist wanted to synthesize the anesthetic 2-ethoxy-2-methylpropane. He used ethoxide ion and 2-chloro-2-methylpropane for his synthesis and ended up with no ether. What was the product of his synthesis? What reagents should he have used?
10
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Textbook Question
Which species in each pair is more stable?
e.
8
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