2.69 Label the Lewis acid and Lewis base in each reaction. Use curved arrows to show the movement of electron pairs.

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**Title: Understanding Lewis Acids and Bases through Example Reactions**

**Introduction to Lewis Acids and Bases:**

In chemistry, Lewis acids and bases are defined by their ability to accept or donate electron pairs. A Lewis acid is a substance that can accept an electron pair, while a Lewis base is one that donates an electron pair. This concept is crucial for understanding various chemical reactions, particularly those involving the formation of new bonds.

**Examples:**

**Reaction a:**

- **Reactants:**
  - Chloride ion (\( \text{Cl}^- \))
  - Boron trichloride (\( \text{BCl}_3 \))

- **Product:**
  - Complex ion: \( \text{Cl} \rightarrow \text{B} \)

- **Description:**
  In this reaction, the chloride ion acts as the Lewis base as it donates an electron pair to boron trichloride. Boron trichloride acts as the Lewis acid because boron, having an incomplete octet, accepts the electron pair.

**Reaction b:**

- **Reactants:**
  - Acetyl chloride (\( \text{OCl} \))
  - Hydroxide ion (\( \text{OH}^- \))

- **Product:**
  - Complex ion: \( \text{OH} \rightarrow \text{C} \)

- **Description:**
  In this reaction, the hydroxide ion donates an electron pair to the carbon of the acetyl chloride, making it the Lewis base. The carbon atom, which is part of a polarized carbonyl group, acts as the Lewis acid by accepting the electron pair.

**Conclusion:**

Understanding which species in a reaction acts as the Lewis acid or base helps in predicting the course of the reaction. By following the movement of electron pairs, illustrated with curved arrows, one can visualize and comprehend the changes taking place during the reaction. This knowledge is foundational for studies in organic and inorganic chemistry.
Transcribed Image Text:**Title: Understanding Lewis Acids and Bases through Example Reactions** **Introduction to Lewis Acids and Bases:** In chemistry, Lewis acids and bases are defined by their ability to accept or donate electron pairs. A Lewis acid is a substance that can accept an electron pair, while a Lewis base is one that donates an electron pair. This concept is crucial for understanding various chemical reactions, particularly those involving the formation of new bonds. **Examples:** **Reaction a:** - **Reactants:** - Chloride ion (\( \text{Cl}^- \)) - Boron trichloride (\( \text{BCl}_3 \)) - **Product:** - Complex ion: \( \text{Cl} \rightarrow \text{B} \) - **Description:** In this reaction, the chloride ion acts as the Lewis base as it donates an electron pair to boron trichloride. Boron trichloride acts as the Lewis acid because boron, having an incomplete octet, accepts the electron pair. **Reaction b:** - **Reactants:** - Acetyl chloride (\( \text{OCl} \)) - Hydroxide ion (\( \text{OH}^- \)) - **Product:** - Complex ion: \( \text{OH} \rightarrow \text{C} \) - **Description:** In this reaction, the hydroxide ion donates an electron pair to the carbon of the acetyl chloride, making it the Lewis base. The carbon atom, which is part of a polarized carbonyl group, acts as the Lewis acid by accepting the electron pair. **Conclusion:** Understanding which species in a reaction acts as the Lewis acid or base helps in predicting the course of the reaction. By following the movement of electron pairs, illustrated with curved arrows, one can visualize and comprehend the changes taking place during the reaction. This knowledge is foundational for studies in organic and inorganic chemistry.
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