Domanda del libro di testo
For each of the following compounds, draw the important resonance forms. Indicate which structures are major and minor contributors or whether they have the same energy.
(g)
(h)
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Ch.1 - Structure and Bonding
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Capitolo 1, Problema 8c
For each of the following compounds, draw the important resonance forms. Indicate which structures are major and minor contributors or whether they have the same energy.
(c) [H2COCH3]+
Guida verificata passo dopo passo1
Identify the structure of the compound [H2COCH3]+. This is a protonated acetaldehyde, where the positive charge is on the oxygen atom.
Draw the Lewis structure of the compound, showing all atoms, bonds, and the positive charge on the oxygen atom.
Consider the movement of electrons to form resonance structures. The positive charge on the oxygen can be delocalized by moving the lone pair of electrons from the oxygen to form a double bond with the adjacent carbon atom.
Draw the resonance structure where the oxygen forms a double bond with the carbon, and the positive charge is now on the carbon atom. This is a major contributor because it allows the positive charge to be on a less electronegative atom (carbon) compared to oxygen.
Evaluate the resonance structures: The structure with the positive charge on the carbon is a major contributor due to the stability provided by the delocalization of charge. The original structure with the positive charge on the oxygen is a minor contributor because the charge is on a more electronegative atom, which is less stable.
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Resonance Structures
Resonance structures are different Lewis structures for a molecule that depict the same arrangement of atoms but differ in the distribution of electrons. They are used to represent delocalized electrons within certain molecules where the bonding cannot be expressed by a single Lewis structure. Understanding resonance is crucial for predicting the stability and reactivity of molecules.
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03:04
Drawing Resonance Structures
Major and Minor Contributors
In resonance, not all structures contribute equally to the resonance hybrid. Major contributors are the most stable structures, typically having the least charge separation and full octets on atoms. Minor contributors are less stable, often with more charge separation or incomplete octets. Identifying these helps in understanding the true electron distribution in the molecule.
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04:42Ortho, Para major products
Formal Charge
Formal charge is a bookkeeping tool used to determine the charge distribution within a molecule. It is calculated by assuming equal sharing of electrons in bonds. Structures with formal charges closest to zero are generally more stable. Calculating formal charges helps in identifying major and minor resonance contributors by highlighting the most stable electron arrangements.
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01:34Calculating formal and net charge.
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