Textbook Question
Rank the following species in each set from best nucleophile to poorest nucleophile.
c. H2O and NH3 in methanol
d. Br−, Cl−, I− in methanol
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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 74b
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 74bChapter 10, Problem 74b
Rank the following species in each set from best nucleophile to poorest nucleophile.
b. 
Verified step by step guidance1
Identify the species in the set and determine their nucleophilic centers. A nucleophile is a species that donates a pair of electrons to form a bond, so look for atoms with lone pairs or π-electrons.
Consider the charge of each species. Negatively charged species are generally stronger nucleophiles than their neutral counterparts because the extra electron density makes them more reactive.
Evaluate the electronegativity of the nucleophilic atom. Less electronegative atoms are better nucleophiles because they are more willing to share their electron density.
Assess the steric hindrance around the nucleophilic center. Bulky groups around the nucleophile can hinder its ability to attack an electrophile, reducing its nucleophilicity.
Take into account the solvent. In polar protic solvents, nucleophilicity decreases as the size of the nucleophile increases (due to hydrogen bonding), while in polar aprotic solvents, nucleophilicity increases with smaller size.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilicity
Nucleophilicity refers to the ability of a species to donate an electron pair to an electrophile during a chemical reaction. It is influenced by factors such as charge, electronegativity, and solvent effects. Generally, negatively charged species are stronger nucleophiles than their neutral counterparts, and less electronegative atoms tend to be better nucleophiles.
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Nucleophilic Addition
Solvent Effects
The solvent can significantly impact nucleophilicity. In polar protic solvents, nucleophiles are often stabilized by solvation, which can hinder their reactivity. Conversely, in polar aprotic solvents, nucleophiles are less solvated and can exhibit greater reactivity, making them more effective in nucleophilic attacks.
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01:16Identification of polarity in solvents
Steric Hindrance
Steric hindrance refers to the spatial arrangement of atoms within a molecule that can impede the approach of a nucleophile to an electrophile. Bulky groups around a nucleophilic center can reduce its ability to effectively attack an electrophile, thus decreasing its nucleophilicity. Understanding steric effects is crucial for ranking nucleophiles in terms of their reactivity.
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Related Practice
Textbook Question
Rank the following species in each set from best nucleophile to poorest nucleophile.
a.
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Textbook Question
Starting with cyclohexene, how can the following compounds be prepared?
b. cyclohexylmethylamine
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Textbook Question
The pKa of acetic acid in water is 4.76. What effect will a decrease in the polarity of the solvent have on the pKa? Why?
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Textbook Question
a. Identify the substitution products that form when 2-bromo-2-methylpropane is dissolved in a mixture of 80% ethanol and 20% water.
b. Explain why the same products are obtained when 2-chloro-2-methylpropane is dissolved in a mixture of 80% ethanol and 20% water.
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Textbook Question
Starting with cyclohexene, how can the following compounds be prepared?
c. dicyclohexyl ether
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