Textbook Question
What nucleophiles would form the following compounds as a result of reacting with 1-iodobutane?
e.
f.
1
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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 69c,d
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 69c,dChapter 10, Problem 69c,d
Which member in each pair in [PROBLEM 9-68] is a better leaving group?
c. H2O or H2S
d. HO− or HS−
Verified step by step guidance1
Step 1: Understand the concept of a leaving group. A leaving group is an atom or group of atoms that can depart with a pair of electrons during a chemical reaction, such as a substitution or elimination reaction. A good leaving group is typically weakly basic and stable after leaving.
Step 2: Compare the acidity of the conjugate acids of the leaving groups. The strength of a leaving group is inversely related to the basicity of the group. The weaker the base, the better the leaving group. For example, the conjugate acids of H2O and H2S are H3O+ and H3S+, respectively. Similarly, the conjugate acids of HO− and HS− are H2O and H2S, respectively.
Step 3: Analyze the stability of the leaving group after departure. Stability is influenced by factors such as electronegativity, size, and polarizability. Larger and more polarizable atoms (like sulfur) tend to stabilize the negative charge better than smaller atoms (like oxygen).
Step 4: For part (c), compare H2O and H2S. H2S is a weaker base than H2O because sulfur is less electronegative and more polarizable than oxygen. Therefore, H2S is a better leaving group than H2O.
Step 5: For part (d), compare HO− and HS−. HS− is a weaker base than HO− for the same reasons as above (sulfur is less electronegative and more polarizable than oxygen). Thus, HS− is a better leaving group than HO−.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Leaving Groups
Leaving groups are atoms or groups of atoms that can depart from a molecule during a chemical reaction, typically in nucleophilic substitution or elimination reactions. A good leaving group is stable after departure, often being a weak base. The ability of a leaving group to stabilize its negative charge or form a stable molecule is crucial in determining its effectiveness.
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Acid-Base Strength
The strength of an acid or base is a key factor in determining the quality of a leaving group. Stronger acids have weaker conjugate bases, which tend to be better leaving groups. For example, H2O is the conjugate base of a strong acid (H3O+), making it a better leaving group than H2S, which is the conjugate base of a weaker acid (H2S).
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Nucleophilicity vs. Leaving Group Ability
Nucleophilicity refers to the ability of a species to donate an electron pair to form a bond, while leaving group ability is about how well a species can depart from a molecule. Generally, a good nucleophile is a poor leaving group and vice versa. Understanding this relationship helps in predicting reaction pathways and the stability of intermediates.
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Related Practice
Textbook Question
Which member of each pair is a better nucleophile in methanol?
e. I− or Br−
f. Cl− or Br−
2
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Textbook Question
Which member in each pair in [PROBLEM 9-68] is a better leaving group?
a. H2O or HO−
b. NH3 or H2O
6
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Textbook Question
What nucleophiles would form the following compounds as a result of reacting with 1-iodobutane?
a.
b.
1
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Textbook Question
Which member in each pair in [PROBLEM 9-68] is a better leaving group?
e. I− or Br−
f. Cl− or Br−
4
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Textbook Question
What product is formed when 1-bromopropane reacts with each of the following nucleophiles?
d. HS−
3
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