Directive effect in disubstituted benzene

         (i) If the directive effects of two reactants reinforce, then a single product is formed.

         Example :

         Thus, both (CH₃, NO₂) direct further substitution to the same position (Ortho with respect to CH₃).

         (ii) If the directing effect of two groups oppose each other strongly activating groups win over deactivating or weakly activating set. The linear sequence of directing energy is

-NH₂ > -OH > -OCH₃- > NHCOCH₃ > -C₆H₅ > CH₃ >  meta directors    

          Example :

         (iii) There is normally little substitution when the two groups are Meta to everyone. Aromatic rings with three conjugant substituents are generally prepared by some other routes.

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