Textbook Question
For each of the reactions in Problem 15, indicate which reactant is the nucleophile and which is the electrophile.
a.
b.
1
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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 14
Bruice 8th EditionCh. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and KineticsProblem 14Chapter 6, Problem 14
Identify the nucleophile and the electrophile in the following acid–base reactions:
a. 
b. 
Verified step by step guidance1
Step 1: Understand the concept of nucleophiles and electrophiles. A nucleophile is an electron-rich species that donates a pair of electrons, while an electrophile is an electron-deficient species that accepts a pair of electrons.
Step 2: Analyze reaction A. In the reaction BH₃ + NH₃ ⇌ H₃B⁻NH₃⁺, BH₃ is electron-deficient due to the incomplete octet of boron, making it the electrophile. NH₃ has a lone pair of electrons on nitrogen, making it the nucleophile.
Step 3: Analyze reaction B. In the reaction HCl + OH⁻ ⇌ Cl⁻ + H₂O, HCl acts as the electrophile because the hydrogen atom is electron-deficient and can accept a pair of electrons. OH⁻ is the nucleophile because it has a lone pair of electrons and a negative charge, making it electron-rich.
Step 4: Recognize the acid-base nature of these reactions. In reaction A, NH₃ acts as a Lewis base (electron donor), and BH₃ acts as a Lewis acid (electron acceptor). In reaction B, OH⁻ acts as a Bronsted-Lowry base (proton acceptor), and HCl acts as a Bronsted-Lowry acid (proton donor).
Step 5: Summarize the identification. For reaction A, NH₃ is the nucleophile and BH₃ is the electrophile. For reaction B, OH⁻ is the nucleophile and HCl is the electrophile.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophile
A nucleophile is a species that donates an electron pair to form a chemical bond in a reaction. Nucleophiles are typically negatively charged or neutral molecules with lone pairs of electrons. In the provided reactions, nucleophiles such as NH3 and OH- attack electrophiles, facilitating the formation of new bonds.
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Nucleophilic Addition
Electrophile
An electrophile is a chemical species that accepts an electron pair from a nucleophile during a reaction. Electrophiles are often positively charged or electron-deficient molecules. In the given reactions, BH3 and HCl act as electrophiles, as they are capable of accepting electron pairs from nucleophiles like NH3 and OH-, respectively.
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Acid-Base Reactions
Acid-base reactions involve the transfer of protons (H+) between reactants, where acids donate protons and bases accept them. These reactions can also be viewed through the lens of nucleophiles and electrophiles, as bases often act as nucleophiles and acids as electrophiles. Understanding this relationship is crucial for identifying the roles of different species in the provided reactions.
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02:49The Lewis definition of acids and bases.
Related Practice
Textbook Question
Calculate ∆G° for the conversion of “axial” methylcyclohexane to “equatorial” methylcyclohexane at 25 °C.
1
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Textbook Question
Draw the isomers for the following compounds and then name each one:
a. 2-methyl-2,4-hexadiene
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Textbook Question
Use curved arrows to show the movement of electrons in the following reaction steps
a.
b.
2
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Textbook Question
Draw the isomers for the following compounds and then name each one:
b. 2,4-heptadiene
1
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Textbook Question
Draw the isomers for the following compounds and then name each one:
c. 1,3-pentadiene
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