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Grade: 11
        

Explain Benzene ring effect. Also give common substituent groups and their effect on EAS, Electrophilic Aromatic Substitution.


 







 









9 years ago

Answers : (1)

shashank Saxena
13 Points
							

 


Substituent groups on a benzene ring affect electrophilic aromatic substitution reactions in two ways:

Reactivity

 

  •      activate  (faster than benzene)
  •      or deactivate (slower than benzene)

Orientation

 

  •     ortho- + para- direction
  •     or meta- direction

    -CH3

 

  •     activates the benzene ring towards EAS
  •     directs substitution to the ortho- & para- positions

             -NO2

 

  •     deactivates the benzene ring towards EAS
  •     directs substitution to the meta- position

 


Common substituent groups and their effect on EAS:



     -NH2, -NHR, -NR2
    -OH
    -OR
    -NHCOCH                                        ortho/para directions
    -C6H5
    -R
    -H
    -X                                
    -CHO, -COR
    -SO3H
    -COOH, -COOR
    -CN                                                  meta directions
    -NR3+
    -NO2

Increasing reactivity from NO2

 

9 years ago
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