Which of the following represents a likely step in the mechanism of the given reaction? HBr Br H Br H

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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It is not B or C

**Title: Understanding Reaction Mechanisms: Identifying Key Steps**

**Text:**

This section focuses on the reaction mechanism involving an alkene and hydrogen bromide (HBr). The task is to identify a likely step in the reaction process that converts the alkene into an alkyl bromide.

**Reaction Scheme:**
1. **Reactants:** An alkene and HBr.
2. **Product:** An alkyl bromide.

**Question:** Which of the following represents a likely step in the mechanism of the given reaction?

**Options:**
1. **Option A:** 
   - Shows the formation of a carbocation on the more substituted carbon of the alkene.
   - The double bond electrons are shown moving towards the hydrogen of HBr, forming a carbocation.

2. **Option B:** 
   - Illustrates a bromonium ion intermediate.
   - The arrow indicates the attack of bromide on the carbocation, but this does not align with the typical electrophilic addition mechanism in this context.

3. **Option C:** 
   - Similar to Option B, also involves bromide interaction.
   - Not typically favored due to the same reasoning as above.

4. **Option D:** 
   - Mimics a hydride shift, which is not characteristic of the electrophilic addition.

**Correct Answer:** Option A, where the mechanism involves the formation of a carbocation after HBr adds to the double bond. This represents a common intermediate step in electrophilic addition reactions of alkenes with HX acids.

Each option illustrates different possibilities of electron movement and intermediate formation, but Option A aligns with the expected pathway for hydrohalogenation, emphasizing the role of carbocations in such mechanisms.
Transcribed Image Text:**Title: Understanding Reaction Mechanisms: Identifying Key Steps** **Text:** This section focuses on the reaction mechanism involving an alkene and hydrogen bromide (HBr). The task is to identify a likely step in the reaction process that converts the alkene into an alkyl bromide. **Reaction Scheme:** 1. **Reactants:** An alkene and HBr. 2. **Product:** An alkyl bromide. **Question:** Which of the following represents a likely step in the mechanism of the given reaction? **Options:** 1. **Option A:** - Shows the formation of a carbocation on the more substituted carbon of the alkene. - The double bond electrons are shown moving towards the hydrogen of HBr, forming a carbocation. 2. **Option B:** - Illustrates a bromonium ion intermediate. - The arrow indicates the attack of bromide on the carbocation, but this does not align with the typical electrophilic addition mechanism in this context. 3. **Option C:** - Similar to Option B, also involves bromide interaction. - Not typically favored due to the same reasoning as above. 4. **Option D:** - Mimics a hydride shift, which is not characteristic of the electrophilic addition. **Correct Answer:** Option A, where the mechanism involves the formation of a carbocation after HBr adds to the double bond. This represents a common intermediate step in electrophilic addition reactions of alkenes with HX acids. Each option illustrates different possibilities of electron movement and intermediate formation, but Option A aligns with the expected pathway for hydrohalogenation, emphasizing the role of carbocations in such mechanisms.
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