The most appropriate reaction for the conversion of bromobenzene to benzoic acid is

Options

A. Reimer-Tiemann reaction
B. Grignard reagent
C. Claisen rearrangement
D. Friedel-Crafts reaction.

Answer

To convert bromobenzene to benzoic acid, we can follow these steps:

### Step 1: Formation of Grignard Reagent
- Start with bromobenzene (C6H5Br).
- React bromobenzene with magnesium (Mg) in dry ether to form the Grignard reagent, phenylmagnesium bromide (C6H5MgBr).

**Hint:** Remember that Grignard reagents are formed by reacting alkyl or aryl halides with magnesium in anhydrous conditions.

### Step 2: Reaction with Carbon Dioxide
- Treat the Grignard reagent (C6H5MgBr) with carbon dioxide (CO2).
- The carbon atom in the Grignard reagent will attack the electrophilic carbon of CO2, leading to the formation of a carboxylate intermediate.

**Hint:** The Grignard reagent acts as a nucleophile and attacks the electrophilic carbon in CO2.

### Step 3: Acid Hydrolysis
- Perform acid hydrolysis on the carboxylate intermediate by adding dilute acid (H3O+).
- This will convert the carboxylate into benzoic acid (C6H5COOH).

**Hint:** Acid hydrolysis is necessary to convert the carboxylate ion into the corresponding carboxylic acid.

### Final Product
- The final product of this reaction sequence is benzoic acid (C6H5COOH).

**Conclusion:** The most appropriate reaction for the conversion of bromobenzene to benzoic acid is through the formation of a Grignard reagent followed by reaction with carbon dioxide and subsequent acid hydrolysis.

### Summary of Steps:
1. **Formation of Grignard Reagent:** Bromobenzene + Mg → C6H5MgBr
2. **Reaction with CO2:** C6H5MgBr + CO2 → Carboxylate Intermediate
3. **Acid Hydrolysis:** Carboxylate Intermediate + H3O+ → Benzoic Acid (C6H5COOH)