Textbook Question
The following reaction steps are shown using conventional electron pushing. (b) Use the bouncing arrow formalism to illustrate the formation of only the product shown.
(c)
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Ch. 8 - Alkenes I: Properties and Electrophilic Additions
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. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 22d
Mullins 1st EditionCh. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 22dChapter 7, Problem 22d
Suggest an alkene that, upon reaction with the appropriate hydrohalic acid, will produce only the alkyl halide shown. [Ignore stereochemistry.]
(d) 
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Identify the structure of the alkyl halide product. Determine the carbon chain length and the position of the halogen atom.
Recall that the addition of a hydrohalic acid (HX) to an alkene follows Markovnikov's rule, where the hydrogen atom from HX adds to the carbon with more hydrogen atoms, and the halogen adds to the carbon with fewer hydrogen atoms.
Determine the position of the double bond in the alkene that would lead to the observed alkyl halide product. The double bond should be located such that the addition of HX results in the halogen being placed on the correct carbon atom.
Consider the possible alkenes that could lead to the desired product. The alkene should have a double bond between the carbon atoms where the halogen and hydrogen will add.
Select the simplest alkene structure that fits the criteria. Ensure that the chosen alkene, when reacted with the hydrohalic acid, will yield the alkyl halide as the sole product, following the regioselectivity dictated by Markovnikov's rule.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Markovnikov's Rule
Markovnikov's Rule states that in the addition of a protic acid (HX) to an alkene, the hydrogen atom from the acid will attach to the carbon with the greater number of hydrogen atoms, while the halide (X) will attach to the carbon with fewer hydrogen atoms. This rule helps predict the major product in hydrohalogenation reactions.
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The 18 and 16 Electron Rule
Carbocation Stability
Carbocation stability is crucial in determining the outcome of reactions involving alkenes and hydrohalic acids. More substituted carbocations (tertiary > secondary > primary) are more stable due to hyperconjugation and inductive effects. This stability influences the pathway and the final product of the reaction.
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Regioselectivity in Addition Reactions
Regioselectivity refers to the preference of one direction of chemical bond making or breaking over all other possible directions. In the context of alkene reactions with hydrohalic acids, regioselectivity determines which carbon atom the halogen will attach to, guided by factors like Markovnikov's Rule and carbocation stability.
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Related Practice
Textbook Question
Which is the most likely transition state for the reactions shown? Explain your answer. [Note the difference in the size of the partial charges or partial unpaired electrons.]
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Textbook Question
A wayward chemist proposed the following mechanism for the addition of HBr to an alkene.
(a) Why is this mechanism unlikely?
(b) Compare the reaction coordinate diagrams for the actual mechanism studied in Section 8.3.1 and this alternate mechanism on the same graph.
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Textbook Question
Which would you expect to be more selective for carbocation formation, the electrophilic addition of HF or HBr to 2-methylbut-2-ene? Explain your answer.
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Textbook Question
Suggest an alkene that, upon reaction with the appropriate hydrohalic acid, will produce only the alkyl halide shown. [Ignore stereochemistry.]
(b)
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Textbook Question
Provide an arrow-pushing mechanism that rationalizes the formation of each alkyl halide in Assessment 8.19.
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