Textbook Question
Under certain conditions, the reaction of 0.5 M 1-bromobutane with 1.0 M sodium methoxide forms 1-methoxybutane at a rate of 0.05 mol/L per second. What would be the rate if 0.1 M 1-bromobutane and 2.0 M NaOCH3 were used?
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Ch.6 - Alkyl Halides; Nucleophilic Substitution
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 6, Problem 11b
Classify each reaction as a substitution, an elimination, or neither. Identify the leaving group in each reaction, and the nucleophile in substitutions.
b. 
Verified step by step guidance1
Identify the type of reaction: The reaction involves the conversion of an alcohol to an alkene, which is characteristic of an elimination reaction. Specifically, this is an E1 elimination reaction where the alcohol is protonated to form a good leaving group.
Determine the leaving group: In the presence of sulfuric acid (H2SO4), the hydroxyl group (OH) of the alcohol is protonated to form water (H2O), which is a good leaving group.
Identify the nucleophile: In elimination reactions, the nucleophile is not directly involved in the reaction mechanism. Instead, the base (in this case, the bisulfate ion, HSO4-) abstracts a proton from the beta-carbon, facilitating the formation of the double bond.
Describe the mechanism: The reaction proceeds via a two-step E1 mechanism. First, the alcohol is protonated by H2SO4, forming a carbocation intermediate after the loss of water. Then, the bisulfate ion abstracts a proton from the adjacent carbon, leading to the formation of the double bond and the alkene product.
Summarize the reaction: The overall reaction is an acid-catalyzed dehydration of an alcohol to form an alkene, with water and bisulfate ion as byproducts. The reaction is driven by the formation of a stable carbocation and the subsequent elimination of a proton to form the double bond.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Substitution Reactions
Substitution reactions involve the replacement of one functional group in a molecule with another. In organic chemistry, this often occurs when a nucleophile attacks an electrophile, leading to the displacement of a leaving group. Understanding the nature of the nucleophile and the leaving group is crucial for classifying the reaction correctly.
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Recognizing Substitution Reactions.
Elimination Reactions
Elimination reactions involve the removal of a small molecule from a larger one, typically resulting in the formation of a double bond. In these reactions, a leaving group departs along with a hydrogen atom from an adjacent carbon, leading to the creation of alkenes. Recognizing the conditions and products of elimination reactions is essential for proper classification.
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00:40Recognizing Elimination Reactions.
Leaving Groups
Leaving groups are atoms or groups that can depart from a molecule during a chemical reaction, often facilitating substitution or elimination processes. A good leaving group is typically stable after departure, such as halides or sulfonate groups. Identifying the leaving group in a reaction is vital for understanding the mechanism and predicting the reaction's outcome.
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Related Practice
Textbook Question
Classify each reaction as a substitution, an elimination, or neither. Identify the leaving group in each reaction, and the nucleophile in substitutions.
c.
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Textbook Question
Show how free-radical halogenation might be used to synthesize the following compounds. In each case, explain why we expect to get a single major product.
(d)
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Textbook Question
Show how free-radical halogenation might be used to synthesize the following compounds. In each case, explain why we expect to get a single major product.
(c)
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Textbook Question
Classify each reaction as a substitution, an elimination, or neither. Identify the leaving group in each reaction, and the nucleophile in substitutions.
a.
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Textbook Question
Consider the reaction of 1-bromobutane with a large excess of ammonia (NH3). Draw the reactants, the transition state, and the products. Note that the initial product is the salt of an amine (RNH3+Br−), which is deprotonated by the excess ammonia to give the amine.
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