SN(EA) | Reaction Mechanism | CSIR NET DEC 2026 | Lec-9 | IFAS

SN(EA) explained with clear concepts and exam-focused approach. This session covers Elimination-Addition reaction mechanism, benzyne intermediate, and regioselectivity for CSIR NET Dec 2026. Learn PYQ tricks and problem-solving strategies for CSIR NET, GATE, and IIT JAM with IFAS expert faculty. 🔥Join India's Best Coaching for CSIR NET and GATE Exams: https://ifasonline.com/csir-net/chemi... https://ifasonline.com/alumninetwork 📞 Need Guidance? Call/WhatsApp: 9172266888 ━━━━━━━━━━━━━━━━━━━━━━━━━ ⏳ Lecture Timeline: [00:00:00] – Introduction of SN(EA) Reaction Mechanism Lec-9 [00:06:20] – Concept: Benzyne Formation from Bromobenzene [00:09:10] – Important: Benzyne sp2 Hybridization [00:13:46] – Trick: Leaving Group Rate Order [00:14:21] – Question 1: OTs + NH2 vs LDA [00:17:16] – Question 2: Chlorobenzene + NaNH2 Products [00:19:04] – Question 3: Star Marked Chlorobenzene Products [00:23:26] – Concept: Inductive Effect in SN(EA) [00:24:09] – Question 4: OMe/Br + NaNH2 Major [00:27:32] – Question 5: Para OMe/Cl Major [00:30:39] – Important: Pyridine SN(EA) vs AE [00:34:53] – Pyridine HA vs HB Proton Abstraction [00:37:30] – Question 6: Phenol O- Effect [00:41:15] – Question 7: Methyl Poor Activator (1:1) [00:44:37] – Question 8: Pyridine + NH2 Product [00:56:00] – Question 9: OMe & Cl Major [00:56:37] – Important: Benzyne 8+2 Cycloaddition [01:00:46] – Question 10: LDA with COOH/OMe [01:03:27] – Trick: COO- has +I Effect [01:06:14] – Question 11: Benzyne + CH2- Attack [01:12:32] – Complete Session (SN(EA) | Reaction Mechanism Lec-9) ━━━━━━━━━━━━━━━━━━━━━━━━━ 📖 Topics Covered in This Lecture: • Elimination-Addition (EA) vs Addition-Elimination (AE): Identification Tricks • Benzyne Intermediate: Hybridization sp2 Concept & Structure • OTs Case: NH2- vs LDA Behaviour & Bulky Base Selection • Regioselectivity in Benzyne: Inductive Effect (-I/+I) Based Product Prediction • Pyridine Case: Lone Pair Repulsion & 1:1 Product Ratio • [8+2] Cycloaddition in EA Reaction: Pericyclic Product Formation ━━━━━━━━━━━━━━━━━━━━━━━━━ 📚 Lecture Summary: In this session, IFAS Expert Faculty focuses on SN(EA) Elimination-Addition reaction mechanism for CSIR NET Dec 2026. Key concepts covered include benzyne formation, hybridization sp2, rate comparison, inductive effect-based regioselectivity, pyridine case with lone pair repulsion, and [8+2] cycloaddition. Problem-solving with PYQ relevance and tricks for major product prediction make this SN(EA) session highly exam-focused. ━━━━━━━━━━━━━━━━━━━━━━━━━ 🎓 This lecture is highly beneficial for students preparing for: ✅ CSIR NET Chemical Science ✅ GATE Chemistry ✅ SET Chemistry ✅ TIFR Chemistry ✅ BARC / DRDO / ISRO Exams ✅ PhD Entrance Exams ━━━━━━━━━━━━━━━━━━━━━━━━━ 🏆 Why IFAS is India’s No. 1 Choice for CSIR NET & GATE Chemistry? (Our Results Speak): ✅ CSIR NET Dec 2025: 4000+ Selections (AIR 3, 8, 9.....) ✅ CSIR NET June 2025: 4200+ Selections (AIR 1, 2, 6, 10...) ✅ CSIR NET Dec 2024: 4000+ Selections (AIR 5, 6, 7, 8, 9...) ✅ CSIR NET June 2024: 2000+ Selections (AIR 3, 10, 13...) ✅ CSIR NET Dec 2023: 1200+ Selections (AIR 2, 4, 5...) 📄 View IFAS Result Sheet: 👉 https://drive.google.com/file/d/1THh6... ━━━━━━━━━━━━━━━━━━━━━━━━━ 🔗 Important Links: 🌍 Visit our Website: https://ifasonline.com 📞 Contact for Queries: 9172266888 📘 Free Counselling: https://ifasonline.com/csir-net/chemi... ━━━━━━━━━━━━━━━━━━━━━━━━━ 🔗 India's Best Online Classes and Books: 🔥CSIR NET Chemical Science Live & Recorded Course: https://ifasonline.com/csir-net/chemi... 🎯 GATE Chemistry Recorded Course: https://ifasonline.com/gate/chemistry... 📘CSIR NET Chemical Science Books: https://ifasonline.com/csir-net/chemi... ━━━━━━━━━━━━━━━━━━━━━━━━━ 📲 Download IFAS App: Android: https://play.google.com/store/apps/de... IOS: https://apps.apple.com/us/app/ifas/id... ━━━━━━━━━━━━━━━━━━━━━━━━━ Stay Updated Via Other Social Media: ✔Telegram: https://t.me/NET_GATE_SET_ChemistryDi... ✔Instagram:   / csir_net_chemical_science   #reactionmechanism #csirnetchemicalscience #gatechemistry #csirnetchemistry #csirnetdec2026 #csirnetlecture #ifaschemistry