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In the reaction:
The electrophile involved is
The electrophile involved is
Explanation
Dichlorocarbene, from $\alpha$-elimination of chloroform, is the electrophile.
Detailed Solution
It is the Reimer–Tiemann reaction. The electrophile formed is $:CCl_2$ (dichlorocarbene) according to the following reactions:
$CHCl_3 + OH^- \rightleftharpoons \overset{\ominus}{C}Cl_3 + H_2O$
$\overset{\ominus}{C}Cl_3 \rightarrow :CCl_2 + Cl^-$ (electrophile)