Textbook Question
a. Which is the most stable: 3,4-dimethyl-2-hexene, 2,3-dimethyl-2-hexene, or 4,5-dimethyl-2-hexene?
b. Which compound has the largest heat of hydrogenation?
c. Which compound has the smallest heat of hydrogenation?
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Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics
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. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 46b
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 46bChapter 6, Problem 46b
Of the compounds you named in Problem 45:
b. Which is the least stable?
a. 
b. 
c. 
d. 
e. 
f. 
Verified step by step guidance1
Step 1: Analyze the stability of each compound based on structural features such as branching, conjugation, and the presence of electronegative atoms or functional groups. Stability is influenced by factors like hyperconjugation, resonance, and steric hindrance.
Step 2: Consider the degree of branching in the alkyl chains. Highly branched compounds tend to be more stable due to hyperconjugation and reduced steric strain.
Step 3: Evaluate the presence of double bonds or functional groups. Conjugated systems (alternating double and single bonds) are generally more stable due to resonance stabilization, while isolated double bonds may be less stable.
Step 4: Examine the presence of electronegative atoms or halogens (e.g., bromine). Electronegative atoms can stabilize the molecule through inductive effects, but they can also introduce steric hindrance depending on their position.
Step 5: Compare all compounds and identify the one with the least stabilizing features, such as minimal branching, lack of conjugation, or steric hindrance caused by bulky groups or functional groups in unfavorable positions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stability of Organic Compounds
The stability of organic compounds is influenced by factors such as bond strength, steric hindrance, and electronic effects. Compounds with lower energy configurations, such as those with fewer steric clashes or more favorable resonance structures, tend to be more stable. Understanding these factors is crucial for predicting which compound might be the least stable in a given set.
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Defining meso compounds.
Resonance Structures
Resonance structures are different ways of drawing the same molecule that illustrate the delocalization of electrons. Compounds with significant resonance stabilization are generally more stable because the electron density is spread over multiple atoms, reducing localized charge and increasing overall stability. Identifying resonance contributors can help assess the stability of the compounds in question.
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03:04Drawing Resonance Structures
Steric Hindrance
Steric hindrance refers to the repulsion between bulky groups within a molecule that can affect its stability and reactivity. When large substituents are close together, they can create strain, making the compound less stable. Evaluating the steric effects in the compounds can provide insight into which one is likely to be the least stable.
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02:53Understanding steric effects.
Related Practice
Textbook Question
Of the compounds you named in Problem 45:
a. Which is the most stable?
a.
b.
c.
d.
e.
f.
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Textbook Question
Name the following:
d.
e.
f.
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Textbook Question
Draw the skeletal structure of 3,3-dimethyl-7-(1-methylethyl)-6-(1-methylpropyl)decane.
Textbook Question
In a reaction in which reactant A is in equilibrium with product B at 25 °C, what relative amounts of A and B are present at equilibrium if ∆G° at 25 °C is
a. 2.72 kcal/mol?
b. 0.65 kcal/mol?
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Textbook Question
Name the following:
c.
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