Sodium phenoxide reacts with `CO_(2)` at `400K` and `4-7` atm pressure to give

Options

A. sodium salicylate
B. salicyladehyde
C. catechol
D. benzoic acid

Answer

To solve the question regarding the reaction of sodium phenoxide with carbon dioxide (CO₂) at 400 K and 4-7 atm pressure, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are sodium phenoxide and carbon dioxide. Sodium phenoxide is derived from phenol by reacting it with sodium hydroxide (NaOH).

**Hint:** Understand the structure of sodium phenoxide, which is phenol (C₆H₅OH) deprotonated by sodium hydroxide.

### Step 2: Understand the Reaction Conditions
The reaction occurs at a temperature of 400 K and a pressure of 4-7 atm. These conditions are typical for the Kolbe's electrolysis or Kolbe's reaction, which involves the carboxylation of phenoxide ions.

**Hint:** Remember that temperature and pressure can affect the outcome of reactions, especially in gas-phase reactions.

### Step 3: Reaction Mechanism
When sodium phenoxide reacts with CO₂ under the specified conditions, it undergoes a carboxylation reaction to form sodium salicylate. The mechanism involves the nucleophilic attack of the phenoxide ion on the carbon dioxide molecule.

**Hint:** Think about how nucleophiles react with electrophiles; in this case, the phenoxide ion acts as a nucleophile.

### Step 4: Formation of Sodium Salicylate
The product formed from this reaction is sodium salicylate (C₇H₅NaO₃). The structure of sodium salicylate includes a sodium ion (Na⁺) and a salicylate ion (C₇H₅O₃⁻), which has both a hydroxyl (-OH) and a carboxylate (-COO⁻) group.

**Hint:** Visualize the structure of sodium salicylate to understand how it is derived from sodium phenoxide and CO₂.

### Step 5: Acidification to Form Salicylic Acid
If sodium salicylate is then acidified (for example, with hydrochloric acid), it can be converted to salicylic acid (C₇H₆O₃), which is also known as 2-hydroxybenzoic acid.

**Hint:** Recall that acidification typically involves the addition of an acid to convert a salt into the corresponding acid.

### Conclusion
The final product of the reaction of sodium phenoxide with CO₂ at 400 K and 4-7 atm pressure is sodium salicylate. Upon acidification, it can yield salicylic acid.

**Final Answer:** Sodium salicylate is formed from the reaction of sodium phenoxide with CO₂ under the given conditions.