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Prachi ghai Grade: 11
        

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


 







 









8 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



 

8 years ago
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