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



7 years ago


Answers : (1)



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



  •      activate  (faster than benzene)

  •      or deactivate (slower than benzene)



  •     ortho- + para- direction

  •     or meta- direction



  •     activates the benzene ring towards EAS

  •     directs substitution to the ortho- & para- positions



  •     deactivates the benzene ring towards EAS

  •     directs substitution to the meta- position


Common substituent groups and their effect on EAS:

     -NH2, -NHR, -NR2



    -NHCOCH                                        ortho/para directions





    -CHO, -COR


    -COOH, -COOR

    -CN                                                  meta directions



Increasing reactivity from NO2


7 years ago

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