In the above reaction product 'P' is : -

Options

A.
B.
C.
D. `C_6H_5-oversetoverset(O)(||)C-C_6H_5`

Answer

To solve the question regarding the product 'P' formed from the reaction of phenylmagnesium bromide (C6H5MgBr) with carbon dioxide followed by hydrolysis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in the reaction are phenylmagnesium bromide (C6H5MgBr) and carbon dioxide (CO2).

2. **Understand the Reaction Type**: The reaction involves a Grignard reagent (C6H5MgBr) reacting with carbon dioxide. Grignard reagents are strong nucleophiles and will undergo nucleophilic addition reactions.

3. **Nucleophilic Addition**: When phenylmagnesium bromide reacts with carbon dioxide, the nucleophilic carbon (from the phenyl group) attacks the electrophilic carbon in carbon dioxide. This results in the formation of a magnesium carboxylate intermediate:
\[ C6H5MgBr + CO2 \rightarrow C6H5COOMgBr \]
Here, the product is a magnesium salt of benzoic acid.

4. **Hydrolysis of the Intermediate**: The next step involves hydrolysis of the magnesium carboxylate intermediate. During hydrolysis, the magnesium salt reacts with water, leading to the formation of benzoic acid (C6H5COOH) and magnesium hydroxide bromide (Mg(OH)Br):
\[ C6H5COOMgBr + H2O \rightarrow C6H5COOH + Mg(OH)Br \]

5. **Identify the Final Product**: The final product 'P' is benzoic acid (C6H5COOH).

### Conclusion:
Thus, the product 'P' formed in the reaction is **benzoic acid**.