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MHT CET Medical202624 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Identify the reagent used in Reimer-Tiemann reaction,

Options

  1. ACHCl ₃ , aq.NaOH
  2. B[ O ] , I ₂/ NaOH
  3. CNaOH , CO ₂ , H ^+
  4. DNaHCO ₃ , Cu

Correct answer

A. CHCl ₃ , aq.NaOH

Step-by-step solution

The Reimer-Tiemann reaction involves the treatment of phenol with chloroform ( CHCl ₃ ) in the presence of an aqueous base such as sodium hydroxide (aq. NaOH) to introduce an aldehyde group ( -CHO ) at the ortho position of the benzene ring, forming salicylaldehyde. The electrophile generated in this reaction is dichlorocarbene ( : CCl ₂ ). Therefore, the reagents used are CHCl ₃ and aq. NaOH. Answer: CHCl ₃ , aq.NaOH

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