Question

In the following reaction sequence, identify compound \( (R) \).

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

In the Kolbe-Schmitt reaction, phenoxide ions react with carbon dioxide to form a carboxylated product.

Answer 1

The Correct Option is A

Step 1: Reaction with \( \text{NaOH} \).
The first step involves the phenol reacting with sodium hydroxide, which converts the phenol group into a phenoxide ion (P). Step 2: Reaction with \( \text{CO}_2 \).
The phenoxide ion then reacts with carbon dioxide under basic conditions, resulting in the formation of a carboxylate anion (Q), which then undergoes protonation in acidic conditions to form a carboxylic acid group (R). Step 3: Conclusion.
Thus, compound \( (R) \) is a carboxylic acid, \( \text{COOH} \). Final Answer: \[ \boxed{\text{COOH}} \]