Carboxylic acids may be prepared by the reaction of Grigrand reagents with .........

Answer

To prepare carboxylic acids using Grignard reagents, follow these steps:

### Step-by-Step Solution:

1. **Identify the Grignard Reagent**:
- A Grignard reagent is generally represented as R-MgX, where R is an organic group (alkyl or aryl) and X is a halogen (like Cl, Br, or I).

2. **React with Carbon Dioxide**:
- The Grignard reagent reacts with carbon dioxide (CO2). Carbon dioxide is a linear molecule with the structure O=C=O.

3. **Formation of the Addition Product**:
- When the Grignard reagent (R-MgX) reacts with CO2, it forms an addition product. The carbon atom of CO2 acts as an electrophile and reacts with the nucleophilic carbon in the Grignard reagent. The product formed is R-C(=O)-MgX.

4. **Hydrolysis**:
- The addition product (R-C(=O)-MgX) is then hydrolyzed by adding water (H2O) in the presence of an acid (H+). This step converts the addition product into a carboxylic acid (R-COOH) and produces magnesium hydroxide halide (Mg(OH)X).

5. **Final Product**:
- The final product of this reaction is a carboxylic acid (R-COOH).

### Conclusion:
Thus, carboxylic acids may be prepared by the reaction of Grignard reagents with carbon dioxide (CO2).

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