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NEET Medium

In the reaction: (Phenol + $CHCl_3$ + $NaOH$ -> Salicylaldehyde derivative), the electrophile involved is

Dichloromethyl anion $(\overset{\ominus}{C}HCl_2)$

Formyl cation $(\overset{\oplus}{C}HO)$

Dichloromethyl cation $(\overset{\oplus}{C}HCl_2)$

Dichlorocarbene $(:CCl_2)$

Step-by-Step Solution

This is the Reimer-Tiemann reaction. The electrophile formed is $:CCl_2$ (Dichlorocarbene) according to the reaction: $CHCl_3 + OH^- \rightleftharpoons \overset{\ominus}{C}Cl_3 + H_2O$ , followed by $\overset{\ominus}{C}Cl_3 \rightarrow :CCl_2 + Cl^-$ .

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