Class 12 Organic Chemistry Lecture 3 | Electrophilic Addition to Alkene & Alkyne | GOC-2

Описание: Class 12 Organic Chemistry Lecture 3 | Electrophilic Addition to Alkene & Alkyne | GOC-2 | ChembyKKSir

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Namaste Dear Students 🙏

Welcome to Class 12 Organic Chemistry — GOC-2 (Reaction Mechanism-2), Lecture 3, where we continue and deepen the concept of ADDITION REACTIONS, focusing on the most common and most important reaction of alkenes and alkynes — ELECTROPHILIC ADDITION.

This lecture is a direct continuation of Lecture 1 and Lecture 2, where the roadmap of GOC-2, carbocation formation and rearrangement were discussed. In Lecture 3, those concepts are applied practically through real reactions and multiple exam-oriented questions.

In this lecture, I — Krishna Kumar Sah (ChembyKKSir) — have explained why alkenes and alkynes predominantly undergo electrophilic addition reactions, due to the presence of loosely held π-electrons, and how reaction outcome is decided by carbocation stability and rearrangement.

The following topics are covered in detail:

• Meaning and mechanism of electrophilic addition reaction
• Why electrophilic addition is the most common reaction of alkenes and alkynes
• Role of π-bond as electron donor

• Addition of HX to alkenes
– Classical carbocation mechanism
– Formation of carbocation intermediate
– Carbocation rearrangement during addition
– 1,2-hydride shift and 1,2-alkyl shift explained within reactions
– Multiple exam-oriented questions solved

• Addition of HX to alkynes
– Stepwise electrophilic addition
– Formation of vinyl carbocation
– Reaction pathway explained clearly

• Why alkynes are less reactive than alkenes towards electrophilic addition
– Stability of carbocation intermediates
– Orbital and electronic explanation
– Conceptual comparison important for NEET & JEE

• Logical prediction of major products
• Common mistakes students make in electrophilic addition reactions

This lecture strengthens the reaction-mechanism-based approach and shows how one carbocation logic explains multiple reactions.

The concepts discussed here form the foundation for almost all Class 12 Organic Chemistry chapters, including:
• Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes, Ketones & Carboxylic Acids
• Amines
• Biomolecules
• Polymers
• Chemistry in Everyday Life

and also integrate Class 11 Hydrocarbons seamlessly.

This lecture is extremely important because:
• Electrophilic addition reactions are frequently asked in NEET & JEE
• Carbocation rearrangement decides final products
• Without this lecture, reaction mechanism remains incomplete

If you clearly understand electrophilic addition to alkene and alkyne,
Organic Chemistry starts behaving logically, not randomly.

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Understand π-electrons, carbocations and rearrangements —
and Organic Chemistry will become your strength.