 
       
      
    The electrophile involved in the above reaction is
dichloromethyl cation  
dichlorocarbene  
trichloromethyl anion 
formyl cation 
 
                
                  As we learnt in
Reimer Tiemann's reaction -
The electrophile used is CCl2 (Dichloromethylene) -CHO is introduced in the ortho position.
- wherein

This is Riemer - Tiemann reaction and electrophile is dichlorocarbene.
Option 1)
dichloromethyl cation  
This option is incorrect.
Option 2)
dichlorocarbene  
This option is correct.
Option 3)
trichloromethyl anion 
This option is incorrect.
Option 4)
formyl cation 
This option is incorrect.
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