Paragraph: Reimer-Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below.
Question: The electrophile in this reaction is

• A

  : CHCL
• B

  ${ }^{+} \mathrm{CHCl}_2$
• Correct answer
  C

  $: \mathrm{CCl}_2$
• D

  $\cdot \mathrm{CCl}_3$

Solution

In Reimer-Tiemann reaction

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