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Krishna Kumar Sah
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Welcome to Krishna Kumar Sah (ChembyKKSir)– Your Trusted Chemistry Mentor for NEET & JEE!
Led by Krishna Kumar Sah Sir (Ex-ALLEN & IITian’s PACE) with 15+ years of experience. Mentored NEET AIR 75, JEE AIR 48, 1000+ MBBS, 150+ NIT & 50+ IITians. Specializes in NCERT-focused Chemistry for Classes 11, 12 & Repeaters.

🎯 What You’ll Learn:
• Chapter-wise Lectures
• Organic, Inorganic & Physical Simplified
• Named Reactions & Mechanisms
• PYQ Analysis, Mock Tests & Rank Boosting Tips

🧪 Focus: Concept Clarity | Confidence | Consistency
🧑‍🏫 AcademicHead – EURO JEE-NEET, PCMC Pune
📍 Based in PCMC, Maharashtra
📞 WhatsApp: 7703821345
🔔 Subscribe & start your NEET-JEE success journey now!

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37:26

24 April 2026

Krishna Kumar Sah

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1:25:50

24 April 2026

Krishna Kumar Sah

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1:03:04

GOC-1 Lecture 6 Part 3 | Lone Pair Conjugation, Localized vs Delocalized & Resonance | ChembyKKSir

Krishna Kumar Sah

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1:12:31

21 April 2026

Krishna Kumar Sah

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21:19

21 April 2026

Krishna Kumar Sah

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18:51

21 April 2026

Krishna Kumar Sah

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52:47

GOC-1 Lecture 6 Part 3 | Conditions of Resonance & π–π Conjugation | ChembyKKSir

Krishna Kumar Sah

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8:43

GOC-1 Lecture 6 Part 2 | Resonance Quick Revision | Mesomeric Effect Recap | ChembyKKSir

Krishna Kumar Sah

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1:35:04

15 April 2026

Krishna Kumar Sah

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54:51

14 April 2026

Krishna Kumar Sah

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1:01:54

11 April 2026

Krishna Kumar Sah

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1:26:17

GOC-1 Lecture 6 Part 1 | Resonance & Mesomeric Effect Started | Canonical Forms | ChembyKKSir

Krishna Kumar Sah

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18:22

18-Min Yoga for JEE/NEET Aspirants 🔥 Pain Relief, Focus & Exam Stamina

Krishna Kumar Sah

Shared 2 weeks ago

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1:22:56

Chemical Kinetics Lecture 3 | Factors Affecting Rate & Rate Law Started | ChembyKKSir

Krishna Kumar Sah

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1:16:27

Chemical Kinetics Lecture 2 | Rate Expression, ROR, ROD, ROE & Instantaneous Rate | ChembyKKSir

Krishna Kumar Sah

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1:18:17

Chemical Kinetics Lecture 1 | Introduction, ROD, ROA, ROR & Basics | ChembyKKSir

Krishna Kumar Sah

Shared 2 weeks ago

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20:41

2 Sisters, 1 Dream, 1 Mentorship | From NEET Struggle to Doctor Journey Podcast

Krishna Kumar Sah

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42:31

GOC-1 Lecture 5 Part 4 | Basic Strength Complete & Questions | Inductive Effect | ChembyKKSir

Krishna Kumar Sah

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43:58

GOC-1 Lecture 5 Part 3 | Acidic Strength Questions & Basic Strength Started | ChembyKKSir

Krishna Kumar Sah

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38:39

GOC-1 Lecture 5 Part 2 | Acidic Strength Complete & Acidic Hydrogen | ChembyKKSir

Krishna Kumar Sah

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56:43

GOC-1 Lecture 5 Part 1 | Stability Questions & Acidic Strength by Inductive Effect | ChembyKKSir

Krishna Kumar Sah

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71 views

1:18:38

Oxyacids Complete Lecture 1 Part 1 | Structure, Naming Rules & Anhydrides | Inorganic | JEE NEET

Krishna Kumar Sah

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54:16

Oxyacids Complete Lecture 1 Part 2 | Structure, Naming Rules & Anhydrides | Inorganic | JEE NEET

Krishna Kumar Sah

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47:41

GOC-1 Lecture 4 Part 3 | Inductive Effect Complete & Stability of Intermediates | ChembyKKSir

Krishna Kumar Sah

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12:38

GOC-1 Lecture 4 Part 2 | Inductive Effect (+I, −I) | Electronic Effect Started | ChembyKKSir

Krishna Kumar Sah

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1:12:42

GOC-1 Lecture 4 Part 1 | Inductive Effect (+I, −I) | Electronic Effect Started | ChembyKKSir

Krishna Kumar Sah

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60 views

1:12:14

GOC-1 Lecture 3 | Heterolysis, Electronic Effects & Organic Intermediates | ChembyKKSir

Krishna Kumar Sah

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50 views

34:46

GOC-1 Lecture 2 | Bond Breaking, Homolysis & Heterolysis | Reaction Mechanism Basics | ChembyKKSir

Krishna Kumar Sah

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47 views

52:53

23 February 2026

Krishna Kumar Sah

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40:02

23 February 2026

Krishna Kumar Sah

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35 views

1:20:00

GOC-2 Lecture 18 | Organometallic Reactions Complete | Grignard RMgX Masterclass | JEE NEET |

Krishna Kumar Sah

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1:31:31

Isomerism Lecture 4 | E–Z System, CIP Rule & Optical Isomerism Introduction | JEE NEET | ChembyKKSir

Krishna Kumar Sah

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1:30:05

GOC-2 Lecture 17 | Aldol & Cannizzaro Reactions Complete | Carbonyl Mechanism | JEE NEET

Krishna Kumar Sah

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7:43

20 February 2026

Krishna Kumar Sah

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54:12

GOC-2 Lecture 16 (Part 1) | Complete Oxidation of Organic Compounds | All Reagents | JEE NEET

Krishna Kumar Sah

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1:15:33

GOC-2 Lecture 16 (Part 2) | Complete Oxidation of Organic Compounds & Ozonolysis | JEE NEET

Krishna Kumar Sah

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58 views

21:10

GOC-2 Lecture 15 (Part 2) | Complete Reduction of Organic Compounds | All Reagents | JEE NEET

Krishna Kumar Sah

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1:41:13

GOC-2 Lecture 15 Part 1 | Complete Reduction of Organic Compounds | All Reagents | JEE NEET

Krishna Kumar Sah

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1:39:28

Isomerism Lecture 6 | R–S Nomenclature, Enantiomer, Diastereomer, Meso & Racemic | JEE NEET#neet2026

Krishna Kumar Sah

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1:49:36

Isomerism Lecture 5 | Optical Isomerism Complete | Chirality, Symmetry & Projections | JEE NEET

Krishna Kumar Sah

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1:19:48

GOC-1 Lecture 1 | Introduction to General Organic Chemistry | NEET Class 11 | ChembyKKSir

Krishna Kumar Sah

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39:08

Thermodynamics & Thermochemistry Lecture 15 (Part 2) | Gibbs Free Energy Complete & TLOT | JEE NEET

Krishna Kumar Sah

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1:45:42

Isomerism Lecture 3 | Stereoisomerism & Geometrical Isomerism (GI) Complete | JEE NEET | ChembyKKSir

Krishna Kumar Sah

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59:51

Ionic Equilibrium Lecture 15 (Part 2) | Indicator pH Range & Acid–Base Titration Curves | JEE NEET

Krishna Kumar Sah

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36:57

GOC-2 Lecture 13 (Part 3) | Alcohol Reactions with HX & BX₃ | SN1 & SN2 Mechanism | JEE NEET

Krishna Kumar Sah

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16:45

GOC-2 Lecture 13 (Part 4) | Alcohol → RCl via PCl₅, PX₅ & SOCl₂ | SN1 vs SN2 (SNi) | JEE NEET

Krishna Kumar Sah

Shared 1 month ago

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27:27

GOC-2 Lecture 13 (Part 2) | SN1 & SN2 of Alcohols | Lucas Test & PX₃/PX₅/SOCl₂ | JEE NEET

Krishna Kumar Sah

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1:10:55

Ionic Equilibrium Lecture 15 (Part 1) | Indicators & Theory of Titration | JEE NEET | ChembyKKSir

Krishna Kumar Sah

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1:08:36

GOC-2 Lecture 14 | SN at sp² Carbon | Haloarenes & SN2TH in Acid Derivatives | JEE NEET |

Krishna Kumar Sah

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1:36:02

Thermodynamics & Thermochemistry L-15 (Part 3) | Entropy, ΔS Total & Gibbs Free Energy | JEE NEET

Krishna Kumar Sah

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1:34:50

GOC-2 Lecture 13 (Part 1) | Substitution vs Elimination | Ambident Nucleophile & Williamson JEE NEET

Krishna Kumar Sah

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1:11:45

Ionic Equilibrium Lecture 14 (Part 3) | Solubility with Common Ion & Complex Formation |JEE Advanced

Krishna Kumar Sah

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1:11:12

GOC-2 Lecture 12 (Part 4) | SN2 of Alkyl Halides Complete | Nucleophilic Substitution JEE NEET 2026

Krishna Kumar Sah

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9:35

🔥 Constant Hard Work Loop? Why 10–12 Hours Study Still Not Giving Marks | NEET 2026 Strategy

Krishna Kumar Sah

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1:20:22

Nucleophilic Substitution Complete | GOC-2 Lec 12 Part 3 | Alkyl Halides SN1 Detailed JEE/NEET 2026

Krishna Kumar Sah

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1:33:04

Thermodynamics Lecture 14 (Part 2) | Entropy Change for All Processes & Phase Transitions | JEE NEET

Krishna Kumar Sah

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27:12

Ionic Equilibrium Lecture 14 (Part 2) | Solubility & Ksp Relationship | JEE NEET | ChembyKKSir

Krishna Kumar Sah

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21:26

Ionic Equilibrium Lecture 14 (Part 1) | Solubility of Sparingly Soluble Electrolytes | JEE NEET

Krishna Kumar Sah

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1:11:27

GOC-2 Lec 12 Part 2 | Everything About Nucleophilicity & Leaving Groups | Target JEE/NEET 2026

Krishna Kumar Sah

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1:31:20

GOC-2 Lec 12 Part 1 | Nucleophilic Substitution (NSR) | Nucleophilicity vs Basicity

Krishna Kumar Sah

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