MHT CET · Chemistry · Alcohols Phenols and Ethers
Which reagent from following is used in Reimer-Tiemann reaction?
- A \(\mathrm{CO}_2, 6 \mathrm{~atm} \mathrm{H}_3 \mathrm{O}^{+}\)
- B \(\mathrm{CHCl}_3\), aq. \(\mathrm{NaOH}, \mathrm{H}_3 \mathrm{O}^{+}\)
- C \(\mathrm{CS}_2\) (at low temperature)
- D \(\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7 / \mathrm{H}_2 \mathrm{SO}_4\)
Answer & Solution
Correct Answer
(B) \(\mathrm{CHCl}_3\), aq. \(\mathrm{NaOH}, \mathrm{H}_3 \mathrm{O}^{+}\)
Step-by-step Solution
Detailed explanation
When phenol reacts with chloroform in the presence of bases \((\mathrm{NaOH} / \mathrm{KOH})\), an aldehyde \((-\mathrm{CHO})\) 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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