Reimer-Tiemann reaction involves

• A

  carbonium ion intermediate
• Correct answer
  B

  carbene intermediate
• C

  carbanion intermediate
• D

  free radical intermediate

Solution

In the Reimer-Tiemann reaction carbene intermediate is formed \(\mathrm{CHCl}_3+\mathrm{OH}^{-} \longrightarrow \mathrm{H}_2 \mathrm{O}+\mathrm{CCl}_3^{-} \longrightarrow \mathrm{Cl}^{-}+ \underset{\text{Dichlorocarbene}}{: \mathrm{CCl}_2}\)

Hence, the correct answer is option: 'B'.