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SN-Ar-(SUBSTITUTION OF GROUP OTHER THAN HYDROGEN:

Nucleophilic substitution not occurs in aromatic compound but few Nucleophilic substitutions occur in the presence of strong nucleophile. These reactions may be SN1 -Aromatic unimolecular and SN2 –Aromatic bimolecular.
SN1 (Aromatic) Type: The decomposition of diazonium salt in polar medium and formation of different product in the presence of different nucleophile are example of Nucleophilic Aromatic Substitution (SN1-Ar). The rate of reaction depends upon only concentration of Aryl cation only hence it is unimolecular reaction.
Aryl cation is very reactive and takes up any nucleophile present recombined with elimination of N2. Therefore reaction is reversible.
Although aryl cation is very unstable , the driving force for it formation of elimination of very stable due to very high bond dissociation of  nitrogen molecule.

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