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MHT CET202615 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Identify the name of reaction when phenol reacts with chloroform in aqueous NaOH.

Options

  1. AKolbe's reaction
  2. BReimer-Tiemann reaction
  3. CWilliamson synthesis
  4. DFriedel-Crafts acylation

Correct answer

B. Reimer-Tiemann reaction

Step-by-step solution

When phenol is treated with chloroform ( CHCl₃ ) in the presence of aqueous sodium hydroxide ( NaOH ), an aldehyde group ( -CHO ) is introduced at the ortho position of the benzene ring. This reaction results in the formation of salicylaldehyde (2-hydroxybenzaldehyde) as the major product. This electrophilic substitution reaction, which proceeds via a dichlorocarbene ( :CCl₂ ) intermediate, is known as the Reimer-Tiemann reaction. Answer: Reimer-Tiemann reaction

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