In the reaction
the electrophile involved is

Options

A. dichloromethyl cation `(underset(+)(C)HCl_(2))`
B. formyl cation `(underset(+)(C)HO)`
C. dichloromethyl anion `(underset(-)(C)HCl_(2))`
D. dichorocarbene `( : C Cl_(2))`

Answer

D

Explanation

It is an example of Reimer Tiemann reaction. The electrophile involved in the reaction is dichlorocarbene `( : C Cl_(2))` and is formed as follows :
`{:(CHCl_(3),+,OH^(-),hArr,overset(..)(C)Cl_(3)+H_(2)O),(,,,,darr-Cl^(-)),(,,,,:C Cl_(2)),(,,,,"Dichlorocarbene (electrophile)"):}`
For more details, consult section 16.