Textbook Question
Draw a reaction coordinate diagram for a reaction in which
a. the product is thermodynamically unstable and kinetically unstable.
b. the product is thermodynamically unstable and kinetically stable.
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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 28
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 28Chapter 6, Problem 28
Rank the following compounds from most stable to least stable:
trans-3-hexene, cis-3-hexene, cis-2,5-dimethyl-3-hexene, (Z)-3,4-dimethyl-3-hexene
Verified step by step guidance1
Step 1: Understand the stability of alkenes. Alkene stability is influenced by factors such as steric hindrance, hyperconjugation, and the degree of substitution of the double bond. More substituted alkenes are generally more stable due to hyperconjugation and electron-donating effects of alkyl groups.
Step 2: Analyze the degree of substitution for each compound. Count the number of alkyl groups attached to the double-bonded carbons. For example, trans-3-hexene and cis-3-hexene are disubstituted alkenes, while cis-2,5-dimethyl-3-hexene and (Z)-3,4-dimethyl-3-hexene are tetrasubstituted alkenes.
Step 3: Consider the stereochemistry of the alkenes. Trans alkenes (E configuration) are generally more stable than cis alkenes (Z configuration) due to reduced steric hindrance between substituents on opposite sides of the double bond.
Step 4: Compare the steric hindrance in the tetrasubstituted alkenes. In cis-2,5-dimethyl-3-hexene, the substituents on the same side of the double bond create more steric strain compared to (Z)-3,4-dimethyl-3-hexene, where the substituents are positioned differently.
Step 5: Rank the compounds based on the above factors. The order of stability will depend on the degree of substitution and the stereochemistry, with tetrasubstituted alkenes being more stable than disubstituted ones, and trans configurations being more stable than cis configurations.
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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 factors such as steric strain and hyperconjugation. Generally, more substituted alkenes are more stable due to increased hyperconjugation and reduced steric hindrance. For example, tetrasubstituted alkenes are typically more stable than disubstituted ones.
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Understanding trends of alkene stability.
Geometric Isomerism
Geometric isomerism, or cis-trans isomerism, occurs due to restricted rotation around a double bond. In alkenes, the 'cis' configuration has substituents on the same side, while 'trans' has them on opposite sides. The trans isomers are usually more stable than their cis counterparts due to reduced steric interactions.
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Substituent Effects on Alkene Stability
The presence and position of substituents on an alkene can significantly affect its stability. Bulky groups can create steric strain when positioned close together, while electron-donating groups can stabilize the double bond through hyperconjugation. Understanding these effects is crucial for ranking the stability of different alkene isomers.
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Related Practice
Textbook Question
The same alkane is obtained from the catalytic hydrogenation of both alkene A and alkene B. The heat of hydrogenation of alkene A is 29.8 kcal/mol, and the heat of hydrogenation of alkene B is 31.4 kcal/mol. Which alkene is more stable?
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Textbook Question
Convert the following perspective formulas to Fischer projections.
(c)
(d)
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Textbook Question
What alkene would you start with if you wanted to synthesize
b. ethylcyclopentane?
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Textbook Question
How many different alkenes can be hydrogenated to form
a. butane?
b. 3-methylpentane?
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Textbook Question
The rate of the reaction of methyl chloride with hydroxide ion is linearly dependent on both the concentration of methyl chloride and the concentration hydroxide ion. At 30 °C, the constant (k) for the reaction is 1.0 × 10-5 M-1 s-1
b. If the concentration of methyl chloride is decreased to 0.010 M, what will be the effect on
1. the rate of the reaction?
2. the rate constant for the reaction?
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