Textbook Question
Which reaction in each of the following pairs takes place more rapidly? (EtOH is ethyl alcohol; Et2O is diethyl ether.)
d.
e.
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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 55b
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 55bChapter 10, Problem 55b
How will the rate of each of the following SN2 reactions change if it is carried out in a more polar solvent?
b. 
Verified step by step guidance1
Step 1: Understand the SN2 reaction mechanism. SN2 reactions are bimolecular nucleophilic substitution reactions where the nucleophile attacks the electrophilic carbon in a single, concerted step, leading to the displacement of the leaving group.
Step 2: Analyze the reaction provided. In this case, the nucleophile (NH3) attacks the electrophilic carbon attached to the leaving group (CH3SCH3+), resulting in the formation of CH3NH3+ and CH3SCH3.
Step 3: Consider the role of the solvent in SN2 reactions. Polar solvents can stabilize the charged transition state and intermediates. However, highly polar solvents may also stabilize the nucleophile, reducing its reactivity and slowing down the reaction rate.
Step 4: Evaluate the specific case. Since NH3 is a neutral nucleophile, a more polar solvent may stabilize the positively charged transition state (CH3SCH3+), potentially increasing the reaction rate. However, excessive stabilization of the nucleophile could counteract this effect.
Step 5: Conclude the impact of a more polar solvent. The rate of the SN2 reaction may increase slightly due to stabilization of the transition state, but the exact effect depends on the balance between nucleophile stabilization and transition state stabilization.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
SN2 Mechanism
The SN2 (substitution nucleophilic bimolecular) mechanism involves a single concerted step where a nucleophile attacks an electrophile, leading to the simultaneous displacement of a leaving group. This reaction is characterized by a second-order kinetics, meaning the rate depends on the concentration of both the nucleophile and the substrate. Understanding this mechanism is crucial for predicting how changes in conditions, such as solvent polarity, will affect the reaction rate.
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Drawing the SN2 Mechanism
Polar Solvents
Polar solvents are solvents that have a significant dipole moment, allowing them to stabilize charged species and polar interactions. In the context of SN2 reactions, polar solvents can stabilize the transition state and the nucleophile, which can enhance the reaction rate. The choice of solvent is critical, as it can influence the solubility of reactants and the overall kinetics of the reaction.
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Nucleophilicity
Nucleophilicity refers to the ability of a nucleophile to donate an electron pair to an electrophile during a chemical reaction. In SN2 reactions, stronger nucleophiles typically lead to faster reaction rates. The polarity of the solvent can affect nucleophilicity; in polar protic solvents, nucleophiles may be less reactive due to solvation effects, while in polar aprotic solvents, nucleophiles remain more reactive, thus influencing the overall rate of the reaction.
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Related Practice
Textbook Question
What products are formed from the following reactions?
b.
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Textbook Question
How will the rate of each of the following SN2 reactions change if it is carried out in a more polar solvent?
a.
1573
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Textbook Question
How will the rate of each of the following SN2 reactions change if it is carried out in a more polar solvent?
c.
1425
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Textbook Question
Amines are good nucleophiles, even though they are neutral. How would the rate of an SN2 reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased?
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1
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Textbook Question
Which reaction in each of the following pairs takes place more rapidly? (EtOH is ethyl alcohol; Et2O is diethyl ether.)
a.
b.
c.
1186
views
1
rank