Isomerism Lecture 6 | R–S Nomenclature, Enantiomer, Diastereomer, Meso & Racemic | JEE NEET скачать в хорошем качестве

Isomerism Lecture 6 | R–S Nomenclature, Enantiomer, Diastereomer, Meso & Racemic | JEE NEET

Isomerism Lecture 6 | R–S Nomenclature, Enantiomer, Diastereomer, Meso & Racemic | JEE NEET | ChembyKKSir ⸻ #Isomerism #OpticalIsomerism #RSConfiguration #CIPRule #Enantiomer #Diastereomer #MesoCompound #RacemicMixture #RacemicModification #Chirality #Stereochemistry #ProjectionFormula #OrganicChemistry #Class11OrganicChemistry #Class12OrganicChemistry #GOC #JEE2026 #NEET2026 #JEEAdvanced #ChemistryByKKSir #ChembyKKSir ⸻ Namaste Dear Students 🙏 Welcome to Isomerism Lecture 6, where we complete the advanced portion of Optical Isomerism and formally enter the R–S system of nomenclature, along with full clarity on enantiomers, diastereomers, meso compounds and racemic mixtures. In previous lectures, we covered: Structural Isomerism, Stereoisomerism, Conformational & Configurational Isomerism, Geometrical Isomerism (C=C, C=N, rings, cumulenes), E–Z system with CIP rule, Chirality, Plane & Center of Symmetry, Projection formulas (Wedge–Dash, Fischer, Newman), and the full foundation of Optical Isomerism. In this lecture, I — Krishna Kumar Sah (ChembyKKSir) — have discussed in complete detail: 🔹 R–S System of Nomenclature • Application of CIP priority rule • Step-by-step assignment of R and S configuration • Clockwise and anticlockwise rule • How to handle lowest priority group orientation • Practice-based explanation 🔹 Enantiomers • Definition and properties • Mirror image relationship • Optical rotation (dextro & levo concept basic link) • Non-superimposability 🔹 Diastereomers • Difference between enantiomer and diastereomer • Identification logic • Stability and property differences 🔹 Meso Compound • Internal plane of symmetry • Why meso compounds are optically inactive • Reduction in number of optical isomers 🔹 Racemic Mixture (± Mixture) • Meaning of racemization • Equal mixture of enantiomers • Why racemic mixture is optically inactive • Racemic modification concept 🔹 Calculation of Optical Isomers • Maximum number = 2ⁿ rule • Effect of meso compound on count • Multiple chiral center problems • JEE Advanced level question patterns 🔥 Why This Lecture Is Extremely Important: • R–S configuration questions are compulsory in JEE Advanced • Meso and racemic concepts are high-frequency topics • Optical isomer counting is a scoring area • Builds complete stereochemistry foundation This lecture integrates the entire Isomerism chapter: Structural Isomerism → Stereoisomerism → Geometrical Isomerism (E–Z, CIP) → Optical Isomerism → Projection Formula → Chirality & Symmetry → R–S Nomenclature → Enantiomer/Diastereomer/Meso/Racemic concepts. If you master R–S configuration and optical isomer calculation, stereochemistry will become one of your strongest chapters 🔥