Textbook Question
Draw resonance contributors for the following ions:
a.
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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 Benzene
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. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblem 66d,e
Bruice 8th EditionCh. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblem 66d,eChapter 9, Problem 66d,e
Are the following pairs of structures resonance contributors or different compounds?
d. 
e. 
Verified step by step guidance1
Step 1: Analyze the structures in pair (a). Both structures have the same molecular formula and connectivity, but the position of the double bond and the positive charge differ. This indicates that they are resonance contributors, as resonance structures differ only in the arrangement of electrons, not the connectivity of atoms.
Step 2: For pair (a), confirm that the positive charge and double bond can be delocalized across the structure. Resonance contributors are representations of the same molecule showing different electron distributions.
Step 3: Analyze the structures in pair (b). Both structures have the same molecular formula and connectivity, but the position of the double bond differs. This suggests that they could be resonance contributors.
Step 4: For pair (b), confirm that the electron movement (delocalization) between the double bond and the carbonyl group is possible. Resonance contributors typically involve the movement of π-electrons or lone pairs to stabilize the molecule.
Step 5: Conclude that both pairs (a) and (b) are resonance contributors, as they represent the same molecule with different electron arrangements, not different compounds.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Resonance Structures
Resonance structures are different ways of drawing the same molecule that illustrate the delocalization of electrons. They are not distinct compounds but rather representations that contribute to the overall hybrid structure of the molecule. The actual structure is a resonance hybrid, which is more stable than any individual resonance form.
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Drawing Resonance Structures
Stability of Resonance Contributors
The stability of resonance contributors is determined by factors such as the presence of full octets, charge distribution, and the electronegativity of atoms. More stable resonance forms contribute more significantly to the resonance hybrid. Structures with minimized formal charges and better charge distribution are generally more favorable.
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Formal Charge
Formal charge is a theoretical charge assigned to an atom in a molecule, calculated based on the number of valence electrons, the number of bonds, and the number of non-bonding electrons. It helps in evaluating the stability of resonance structures; structures with formal charges closer to zero are typically more stable and preferred in resonance contributors.
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Related Practice
Textbook Question
a. Draw resonance contributors for the following species. Do not include structures that are so unstable that their contributions to the resonance hybrid would be negligible. Indicate which are major contributors and which are minor contributors to the resonance hybrid.
b. Do any of the species have resonance contributors that all contribute equally to the resonance hybrid?
15.
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Textbook Question
a. Draw resonance contributors for the following species. Do not include structures that are so unstable that their contributions to the resonance hybrid would be negligible. Indicate which are major contributors and which are minor contributors to the resonance hybrid.
b. Do any of the species have resonance contributors that all contribute equally to the resonance hybrid?
5.
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Textbook Question
a. How many linear dienes have molecular formula C6H10? (Disregard cis–trans isomers.)
b. How many of the linear dienes in part a are conjugated dienes?
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Textbook Question
Draw resonance contributors for the following ions:
d.
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Textbook Question
Draw all the products of the following reaction:
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