Textbook Question
If Kekulé's original hypothesis had been correct and benzene was really an equilibrium between two structures, how many distinct isomers would exist for 1,2-dichlorobenzene?
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Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions
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. 23 - Benzene I: Aromatic Stability and Substitution ReactionsProblem 5a
Mullins 1st EditionCh. 23 - Benzene I: Aromatic Stability and Substitution ReactionsProblem 5aChapter 22, Problem 5a
Suggest an arrow-pushing mechanism that accounts for the formation of the following Lewis acid–Lewis base complexes. Label the Lewis acid and Lewis base in each.
(a) 
Verified step by step guidance1
Step 1: Identify the Lewis acid and Lewis base in the reaction. A Lewis acid is an electron pair acceptor, while a Lewis base is an electron pair donor. Look for species with an empty orbital (Lewis acid) and species with a lone pair of electrons (Lewis base).
Step 2: Draw the starting structures of the reactants. Represent the Lewis acid with its empty orbital and the Lewis base with its lone pair of electrons clearly visible.
Step 3: Use curved arrows to show the movement of electrons. The arrow should originate from the lone pair on the Lewis base and point toward the empty orbital of the Lewis acid, indicating the formation of a coordinate covalent bond.
Step 4: Draw the resulting Lewis acid–Lewis base complex. This should show the Lewis acid and Lewis base connected via the newly formed bond, with the lone pair of electrons now shared between the two species.
Step 5: Verify the mechanism by ensuring that all atoms obey the octet rule (if applicable) and that the electron movement is consistent with the properties of the Lewis acid and Lewis base.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Lewis Acids and Bases
Lewis acids are species that can accept an electron pair, while Lewis bases are species that can donate an electron pair. This definition expands beyond traditional Brønsted-Lowry acids and bases, allowing for a broader understanding of acid-base reactions. In the context of the question, identifying the Lewis acid and base is crucial for proposing an appropriate arrow-pushing mechanism.
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02:49
The Lewis definition of acids and bases.
Arrow-Pushing Mechanism
Arrow-pushing mechanisms are a way to illustrate the movement of electrons during chemical reactions. In these diagrams, arrows represent the flow of electron pairs, indicating how bonds are formed or broken. Understanding this mechanism is essential for visualizing how Lewis acids and bases interact to form complexes, as it helps clarify the electron transfer process.
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04:32General Mechanism
Formation of Lewis Acid-Base Complexes
The formation of Lewis acid-base complexes involves the interaction between a Lewis acid and a Lewis base, resulting in a coordinate covalent bond. This process is characterized by the donation of an electron pair from the base to the acid. Recognizing the nature of these complexes is vital for predicting the stability and reactivity of the resulting species in organic chemistry.
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02:49The Lewis definition of acids and bases.
Related Practice
Textbook Question
Suggest an arrow-pushing mechanism that accounts for the formation of the following Lewis acid–Lewis base complexes. Label the Lewis acid and Lewis base in each.
(b)
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Textbook Question
The average C―C single bond length is 1.53 Å, and the average C=C double bond length is 1.31 Å. All of the C―C bonds in benzene are the same length (1.42 Å). Explain.
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Textbook Question
Draw resonance structures to identify which of the following is the more stable carbocation.
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