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The reaction of chloromethane with hydroxide ion at 30 °C has a ΔG° value of −21.7 kcal/mol. What is the equilibrium constant for the reaction?
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Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- 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 HalidesProblema 129
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblema 129Capitolo 9, Problema 129
When equivalent amounts of methyl bromide and sodium iodide are dissolved in methanol, the concentration of iodide ion quickly decreases and then slowly returns to its original concentration. Account for this observation.
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Step 1: Recognize that the reaction involves methyl bromide (CH₃Br) and sodium iodide (NaI) in methanol. This is a classic example of an SN2 (bimolecular nucleophilic substitution) reaction.
Step 2: In the SN2 reaction, the iodide ion (I⁻) acts as a nucleophile and attacks the carbon atom in methyl bromide, which is electrophilic due to the polar C-Br bond. This results in the displacement of the bromide ion (Br⁻) and the formation of methyl iodide (CH₃I). The reaction can be represented as: CH₃Br + I⁻ → CH₃I + Br⁻.
Step 3: The initial decrease in iodide ion concentration is due to its consumption in the SN2 reaction to form methyl iodide. This explains the rapid drop in iodide ion concentration.
Step 4: Over time, the methyl iodide (CH₃I) formed in the reaction can undergo a reverse reaction with bromide ion (Br⁻) in the methanol solvent. This reverse reaction regenerates iodide ion (I⁻) and methyl bromide (CH₃Br). The equilibrium between these species accounts for the slow return of iodide ion concentration to its original level.
Step 5: Conclude that the observed changes in iodide ion concentration are due to the dynamic equilibrium established between the forward SN2 reaction and the reverse reaction in the methanol solvent. This equilibrium allows the iodide ion concentration to eventually stabilize.
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Nucleophilic Substitution Reactions
Nucleophilic substitution reactions involve the replacement of a leaving group in a molecule by a nucleophile. In this case, iodide ion (I-) acts as a nucleophile attacking methyl bromide (CH3Br), leading to the formation of methyl iodide (CH3I) and bromide ion (Br-). Understanding this mechanism is crucial to explain the initial decrease in iodide concentration.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Equilibrium and Reaction Dynamics
Chemical reactions often reach a state of equilibrium where the rates of the forward and reverse reactions are equal. The initial decrease in iodide concentration suggests that it is being consumed in the reaction with methyl bromide, while the slow return to its original concentration indicates that the reverse reaction or a secondary reaction is occurring, allowing iodide to regenerate over time.
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04:00Determining Acid/Base Equilibrium
Solvent Effects on Reaction Rates
The choice of solvent can significantly influence the rate and outcome of chemical reactions. Methanol, being a polar protic solvent, stabilizes ions and can affect the nucleophilicity of iodide. This stabilization may lead to a slower reaction rate after the initial consumption of iodide, contributing to the observed dynamics of iodide concentration in the solution.
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5:07Rates of Intramolecular Reactions Concept 2
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