H3C H3C CH3 CH3 FCH₂ H₂O*, heat CH3 Draw curved arrows to show the movement of electrons in this step of the mechanism. H3C H₂O CH3 ОН CH3 H3C CH3 :OH₂ CH CH3

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Chapter1: Chemical Foundations
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### Electrophilic Addition Reaction Mechanism

In the given reaction, a double bond in hexene reacts with an acid to form an alcohol product.

#### Step 1: Protonation of the Alkene

- **Reactants:** Hex-2-ene (C₆H₁₂) and hydronium ion (H₃O⁺, shown as "H₃O⁺, heat").
- **Reaction:** The alkene (CH₃CH₂CH=CHCH₃) undergoes protonation. The double bond attacks the hydrogen from the hydronium ion, resulting in the formation of a carbocation and water.

#### Step 2: Formation of the Carbocation

- **Carbocation Formation:** A carbocation is formed at the more stable secondary position adjacent to the double bond (CH₃CH₂CH⁺CHCH₃).

- **Diagram Explanation:** 
  - A water molecule with two lone pairs (H₂O:) approaches the carbocation.

#### Step 3: Nucleophilic Attack

- **Water as a Nucleophile:** The water molecule donates a pair of electrons to the carbocation, forming a bond and resulting in a protonated alcohol intermediate (CH₃CHOH⁺CH₂CH₂CH₃).

#### Curved Arrows

- Curved arrows can be drawn:
  1. From the double bond to the hydrogen on hydronium ion.
  2. From the lone pair on the oxygen of the water molecule to the carbocation.

This mechanism emphasizes the movement of electrons during the reaction, demonstrating how electrophilic addition occurs with alkenes. These steps illustrate the transformation from an alkene to an alcohol through protonation, carbocation formation, and nucleophilic attack.
Transcribed Image Text:### Electrophilic Addition Reaction Mechanism In the given reaction, a double bond in hexene reacts with an acid to form an alcohol product. #### Step 1: Protonation of the Alkene - **Reactants:** Hex-2-ene (C₆H₁₂) and hydronium ion (H₃O⁺, shown as "H₃O⁺, heat"). - **Reaction:** The alkene (CH₃CH₂CH=CHCH₃) undergoes protonation. The double bond attacks the hydrogen from the hydronium ion, resulting in the formation of a carbocation and water. #### Step 2: Formation of the Carbocation - **Carbocation Formation:** A carbocation is formed at the more stable secondary position adjacent to the double bond (CH₃CH₂CH⁺CHCH₃). - **Diagram Explanation:** - A water molecule with two lone pairs (H₂O:) approaches the carbocation. #### Step 3: Nucleophilic Attack - **Water as a Nucleophile:** The water molecule donates a pair of electrons to the carbocation, forming a bond and resulting in a protonated alcohol intermediate (CH₃CHOH⁺CH₂CH₂CH₃). #### Curved Arrows - Curved arrows can be drawn: 1. From the double bond to the hydrogen on hydronium ion. 2. From the lone pair on the oxygen of the water molecule to the carbocation. This mechanism emphasizes the movement of electrons during the reaction, demonstrating how electrophilic addition occurs with alkenes. These steps illustrate the transformation from an alkene to an alcohol through protonation, carbocation formation, and nucleophilic attack.
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