Mesomeric Effect || +M and -M Groups Identification || +I and -I Groups Identification

Mesomeric Effect (±M, ±R)

(GOC) : Mesomeric Effect (+M and -M),Identification OF +M and -M Groups, Application on Stability OF Intermediates

Method OF Identification OF +I and -I Group and +I and -I Series

Method OF Identification OF +I and -I Group and +I and -I Series

Types OF R-Effect (+R, -R, both Group Identification)

Types OF Mesomeric Effect or Resonance Effect|| Identification OF +R, -R, both +R and - R Group

Introduction OF Mesomeric Effect (+M and -M Effect)|| Hyperconjugation|| Carbocation Stability

Resonance |Mesomeric Effect| +M Group| -M Group - Electron Withdrawing Group|Summary

Identification OF anions||Weak group||Strong group

In the electrophilic substituion of benzene ring, the second substituent is directed by the group already present. Electron releasing groups (+I and +M) are ortho-para-directing and activating, whreas the electron withdrawing groups (-I and -M) are meta-directing and deactivating. Halogens are placed under the category of +T (Tautomeric) groups because they have -Ibdyctuve abd +Mesomeric effect. These groups are deactivating but ortho-para-directing. In the introduction of third group to the benzene ring, the product of minimum steric gindrance is formed. In the reaction Which of the following products is not formed at all ?