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Question:

In the reaction the electrophile involved is: dichloromethyl anion (⁻CHCl₂), dichloromethyl cation (⁺CHCl₂), dichlorocarbene (:CCl₂), formyl cation (⁺CHO)

dichloromethyl cation(⊕CHCl2)

dichloromethyl anion(⊖CHCl2)

formyl cation(⊕CHO)

dichlorocarbene(:CCl2)

Solution:

In the reaction the electrophile involved is dichlorocarbene (:CCl₂). In Reimer-Tiemann reaction, phenol in presence of NaOH reacts with chloroform to give salicyladehyde. Option D is correct.