Question

Match List-I with List-II.

Choose the correct answer from the options given below:

• A. (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
• B. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
• C. (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
• D. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Answer 1

The Correct Option is D

To solve the problem of matching reactions with their respective reagents, we need to identify which reagents correspond to each reaction in the provided lists. 

1. Reaction (A): Conversion of phenol to salicylic acid.
   • This reaction is known as the Kolbe-Schmitt reaction, where sodium phenoxide reacts with carbon dioxide under pressure, followed by acidification to produce salicylic acid.
   • The reagents for this reaction are \((\text{IV}) \, \text{(i) NaOH, (ii) CO}_2, \text{(iii) HCl}\).
2. Reaction (B): Conversion of phenol to salicylaldehyde.
   • This is a typical Reimer-Tiemann reaction, where phenol reacts with chloroform in the presence of a base to form an aldehyde group ortho to the hydroxyl group.
   • The correct reagents are \((\text{III}) \, \text{(i) NaOH, CHCl}_3, \text{(ii) NaOH, (iii) HCl}\).
3. Reaction (C): Conversion of phenol to para-benzoquinone.
   • This is an example of the oxidation of phenol to para-benzoquinone using an oxidizing agent like sodium dichromate and sulfuric acid.
   • The correct reagents are \((\text{I}) \, \text{Na}_2\text{Cr}_2\text{O}_7, \text{H}_2\text{SO}_4\).
4. Reaction (D): Conversion of phenol to anisole.
   • This involves the methylation of phenol, where phenol reacts with methyl chloride in the presence of a base.
   • The correct reagents are \((\text{II}) \, \text{(i) NaOH, (ii) CH}_3\text{Cl}\).

Thus, the correct matching of List-I with List-II is (A)-(IV), (B)-(III), (C)-(I), (D)-(II).

Answer 2

(A) Oxidation of phenol to benzoquinone: This reaction uses \( \text{Na}_2\text{Cr}_2\text{O}_7 \) and \( \text{H}_2\text{SO}_4 \) as the oxidizing agents.

(B) Kolbe’s reaction: It involves carboxylation of phenol using \( \text{NaOH} \) and \( \text{CO}_2 \), followed by acidification with \( \text{HCl} \).

(C) Reimer-Tiemann reaction: This reaction introduces an aldehyde group on the phenol ring using \( \text{NaOH} \) and \( \text{CHCl}_3 \).

(D) Williamson’s synthesis: It prepares ethers by reacting phenoxide with \( \text{CH}_3\text{Cl} \) in the presence of \( \text{NaOH} \).

The Correct answer is: (A)-(IV), (B)-(III), (C)-(I), (D)-(II)