Domanda del libro di testo
Which acid in each pair would you expect to more readily donate a proton to a basic compound?
(b)
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Ch. 4 - Acids and Bases/Electron Flow
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases/Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Non è quello che usi tu?Cambia libro di testo
Capitolo 3, Problema 47
Rationalize the rather large difference in pKa values for the two carboxylic acids shown.
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Identify the two carboxylic acids in question and note their structural differences. The pKₐ value of a carboxylic acid is influenced by the stability of its conjugate base, which is affected by electronic effects such as resonance, inductive effects, and steric factors.
Examine the substituents attached to the carboxylic acids. Electron-withdrawing groups (e.g., halogens, nitro groups) stabilize the conjugate base by delocalizing the negative charge through inductive or resonance effects, leading to a lower pKₐ. Conversely, electron-donating groups destabilize the conjugate base, increasing the pKₐ.
Analyze resonance effects. If the conjugate base of one carboxylic acid has resonance structures that delocalize the negative charge over multiple atoms, it will be more stable, resulting in a lower pKₐ. Compare the extent of resonance stabilization between the two acids.
Consider inductive effects. Electron-withdrawing groups positioned near the carboxylic acid group pull electron density away, stabilizing the conjugate base. Evaluate the proximity and strength of any electron-withdrawing or donating groups in the two acids.
Assess steric factors. Bulky substituents near the carboxylic acid group can hinder solvation of the conjugate base, making it less stable and increasing the pKₐ. Compare the steric environment around the carboxylic acid groups in the two molecules.
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pKₐ and Acid Strength
pKₐ is a measure of the acidity of a compound, specifically the negative logarithm of the acid dissociation constant (Kₐ). A lower pKₐ value indicates a stronger acid, as it signifies a greater tendency to donate protons (H⁺) in solution. Understanding pKₐ is essential for comparing the acidity of different carboxylic acids and rationalizing their differences.
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03:09
The 3 factors that determine the strength of inductive effects.
Resonance Stabilization
Resonance stabilization refers to the delocalization of electrons across multiple structures, which can enhance the stability of a conjugate base formed after deprotonation. In carboxylic acids, the presence of resonance structures can significantly affect their acidity; acids with more resonance stabilization in their conjugate base will typically have lower pKₐ values, making them stronger acids.
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03:43The radical stability trend.
Inductive Effect
The inductive effect involves the transmission of charge through a chain of atoms in a molecule, influenced by electronegative atoms or groups. Electron-withdrawing groups can stabilize the negative charge on the conjugate base of a carboxylic acid, thereby increasing its acidity. Understanding how different substituents affect the inductive effect is crucial for rationalizing the differences in pKₐ values between carboxylic acids.
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01:47Understanding the Inductive Effect.
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