Reimer-Tiemann reaction introduces|CHEMISTRY|JEEAdvanced2007

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JEE Advance2007

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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 salicyladehydes as depicted below.
The electrophile in this reaction is

Select the correct option:

A

: CHCl

B

${ }^{+} \mathrm{CHCl}_2$

C

: $\mathrm{CCl}_2$

D

. $\mathrm{CCl}_3$

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