Textbook Question
We discuss the following reactions in subsequent chapters. Given the mechanisms shown, draw the mechanism of the reverse reaction.
(b)
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Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- 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 I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: 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 I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: 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: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 5 - Chemical Reaction Analysis: Thermodynamics and KineticsProblem 29b
Mullins 1st EditionCh. 5 - Chemical Reaction Analysis: Thermodynamics and KineticsProblem 29bChapter 4, Problem 29b
For the following acid–base reactions studied in Assessment 5.25, draw a likely transition state. Be sure to indicate in your drawing the degree to which bonds are broken or formed.
(b) 
Verified step by step guidance1
Step 1: Identify the acid and base in the reaction. In the given reaction, the molecule with the hydroxyl group (-OH) acts as the acid, donating a proton (H⁺), while the molecule with the amine group (-NH₂) acts as the base, accepting the proton.
Step 2: Recognize the transition state. The transition state represents the intermediate structure where bonds are partially broken and formed. In this case, the O-H bond of the acid is partially broken, and the N-H bond of the base is partially formed.
Step 3: Draw the transition state. Represent the O-H bond as partially broken using a dashed line, and the N-H bond as partially formed using another dashed line. Indicate the movement of electrons with curved arrows: one arrow showing the lone pair on nitrogen attacking the hydrogen, and another arrow showing the bond between oxygen and hydrogen breaking.
Step 4: Include partial charges in the transition state. The oxygen atom will have a partial negative charge (δ⁻) due to the breaking of the O-H bond, and the nitrogen atom will have a partial positive charge (δ⁺) due to the formation of the N-H bond.
Step 5: Verify the transition state drawing. Ensure that the drawing accurately represents the intermediate structure with partial bonds and charges, and that it aligns with the acid-base reaction mechanism.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Base Reactions
Acid-base reactions involve the transfer of protons (H+) between reactants. An acid donates a proton, while a base accepts it. Understanding the nature of acids and bases, including their strength and the concept of conjugate pairs, is essential for predicting the outcome of these reactions and drawing accurate transition states.
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02:49
The Lewis definition of acids and bases.
Transition States
A transition state represents a high-energy, unstable arrangement of atoms that occurs during the transformation from reactants to products. It is characterized by partially formed and broken bonds. Drawing a transition state requires an understanding of the molecular geometry and the changes in bonding that occur as the reaction progresses.
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06:55Intermediates vs. Transition States
Bond Formation and Breaking
In chemical reactions, bonds between atoms are either formed or broken. The extent of bond formation and breaking can be depicted in a transition state diagram. Recognizing which bonds are involved and the degree to which they are altered is crucial for accurately representing the transition state and understanding the reaction mechanism.
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02:31Identifying Bond Breaking
Related Practice
Textbook Question
For the reaction coordinate diagram shown, is the forward or reverse reaction faster?
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Textbook Question
We discuss the following reactions in subsequent chapters. Given the mechanisms shown, draw the mechanism of the reverse reaction.
(a)
1
views
Textbook Question
For the following acid–base reactions studied in Assessment 5.25, draw a likely transition state. Be sure to indicate in your drawing the degree to which bonds are broken or formed.
(a)
1
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Textbook Question
For the following acid–base reactions studied in Assessment 5.25, draw a likely transition state. Be sure to indicate in your drawing the degree to which bonds are broken or formed.
(c) H3O+ + Br– ⇌ H2O + HBr
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Textbook Question
Within the following pairs, pick which reaction you would expect to be faster based on having a higher value of the frequency factor (A).
(b)
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