IIT JEE
Senior / 12th grade
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Summary
General organic chemistry
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---11August 20252025/2026
- 1. Inductive Effect (I-effect) 
 
Electron-withdrawing or donating through sigma bond 
 
+I and –I groups 
 
 
2. Resonance (Mesomeric Effect / M-effect) 
 
Delocalization of π-electrons 
 
Resonating structures 
 
+M and –M groups 
 
Resonance stability 
 
 
3. Electromeric Effect (E-effect) 
 
Temporary shift of electrons under the influence of an attacking reagent 
 
+E and –E effect 
 
 
4. Hyperconjugation 
 
Delocalization involving σ-electrons (especially C-H adjacent to double bo...
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