NO2 is in the form of O=N+-O, As a nucleophilic leaving group it should be in form of O=N-O¯. So the correct option is first one.
What is nucleophilic aromatic substitution?
- It is a classical reaction in which a nucleophile displaces a leaving group on an aromatic ring.
- The presence of electron-withdrawing group increases the rate of nucleophilic aromatic substitution
- Nucleophilic aromatic substitution does not follow SN2 reaction mechanism, as the substitution takes place at trigonal carbon atom having sp3 hybridisation.
- It does not follow the SN2 reaction mechanism because of the steric hindrance of the benzene ring.
- Nucleophilic aromatic substitution may follow SN1 reaction mechanism in presence of an excellent leaving group.
- SN1 reaction would involve elimination of leaving group and formation of aryl carbocation.
- Generally, Nucleophilic aromatic substitution follows elimination addition or addition elimination pathway.
NO2 is in the form of O=N+-O, As a nucleophilic leaving group it should be in form of O=N-O¯. So the correct option is first one.
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