Question:
Identify the name of reaction when phenol reacts with chloroform in aqueous NaOH.
Identify the name of reaction when phenol reacts with chloroform in aqueous NaOH.
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Phenol + CHCl3 + NaOH gives salicylaldehyde: the Reimer-Tiemann reaction.
Updated On: Oct 1, 2026
- Kolbe's reaction
- Reimer-Tiemann reaction
- Williamson synthesis
- Friedel-Crafts acylation
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Phenol is activated for electrophilic substitution at the ortho position.
Step 2: Detailed Explanation
With chloroform and aqueous NaOH, dichlorocarbene (\(:\text{CCl}_2\)) forms and attacks the phenoxide ring, giving salicylaldehyde after hydrolysis. This is the Reimer-Tiemann reaction.
Kolbe reaction uses \(\text{CO}_2\) with sodium phenoxide to give salicylic acid. Williamson synthesis makes ethers. Friedel-Crafts acylation uses acyl chloride and AlCl3.
Final Answer:
The reaction is the Reimer-Tiemann reaction, option (B). \[ \boxed{\text{Reimer-Tiemann}} \]
Phenol is activated for electrophilic substitution at the ortho position.
Step 2: Detailed Explanation
With chloroform and aqueous NaOH, dichlorocarbene (\(:\text{CCl}_2\)) forms and attacks the phenoxide ring, giving salicylaldehyde after hydrolysis. This is the Reimer-Tiemann reaction.
Kolbe reaction uses \(\text{CO}_2\) with sodium phenoxide to give salicylic acid. Williamson synthesis makes ethers. Friedel-Crafts acylation uses acyl chloride and AlCl3.
Final Answer:
The reaction is the Reimer-Tiemann reaction, option (B). \[ \boxed{\text{Reimer-Tiemann}} \]
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