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MHT CET202411 May 2024Morning ShiftChemistryAlcohols Phenols and EthersActual

Which reagent from following is used in Reimer-Tiemann reaction?

Options

  1. ACO ₂, 6 ~atm H ₃ O ⁺
  2. BCHCl ₃ , aq. NaOH , H ₃ O ⁺
  3. CCS ₂ (at low temperature)
  4. DNa ₂ Cr ₂ O ₇ / H ₂ SO ₄

Correct answer

B. CHCl ₃ , aq. NaOH , H ₃ O ⁺

Step-by-step solution

When phenol reacts with chloroform in the presence of bases ( NaOH / KOH ) , an aldehyde (- CHO ) group gets introduced in the ring at a position ortho to the phenolic group and salicylaldehyde is formed. This reaction is called the Reimer-Tiemann reaction.

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