Re-NEET 2026 Chemistry — All Named Reactions, Formulas & High-Weightage Chapters for June 21
NEET Chemistry carries 180 marks — one-third of the total score. Unlike Biology, Chemistry combines memory-based theory with logical problem-solving. Prioritising high-scoring chapters allows you to maximise marks with efficient effort.
With 5 days left for Re-NEET 2026, Chemistry is where you can gain or lose 40–60 marks quickly. This guide gives you everything — chapter weightage, all named reactions, and Physical Chemistry formulas — in one place.
📊 Chemistry Chapter-Wise Weightage
NEET Chemistry is divided into Physical, Organic, and Inorganic Chemistry. Physical Chemistry is stable and concept-driven with essential numerical practice. Inorganic Chemistry depends largely on NCERT reading with direct questions. Organic Chemistry remains high every year with special focus needed on reaction mechanisms and named reactions.
Physical Chemistry — ~13 questions • Mole Concept & Stoichiometry: 2–3 (🔴 Very High) • Chemical Bonding: 2–3 (🔴 Very High) • Thermodynamics: 2–3 (🔴 Very High) • Equilibrium: 2–3 (🔴 Very High) • Atomic Structure: 1–2 (🟠 High) • Electrochemistry: 1–2 (🟠 High) • Chemical Kinetics: 1–2 (🟠 High) • Solutions: 1–2 (🟠 High)
Organic Chemistry — ~14 questions • General Organic Chemistry: 2–3 (🔴 Highest) • Aldehydes, Ketones & Carboxylic Acids: 2–3 (🔴 Very High) • Alcohols, Phenols & Ethers: 2–3 (🔴 Very High) • Hydrocarbons: 2–3 (🔴 Very High) • Amines: 1–2 (🟠 High) • Biomolecules & Polymers: 1–2 (🟠 High)
Inorganic Chemistry — ~18 questions • Coordination Compounds: 3–4 (🔴 Highest) • p-Block Elements: 3–4 (🔴 Very High) • d & f Block Elements: 2–3 (🔴 Very High) • Periodic Table & Properties: 2–3 (🟠 High)
🧪 All Named Reactions — Memorise Every One
Named reactions carry heavy weight in NEET Organic Chemistry. Study functional groups, review named reactions, and learn how reactions work.
Aldehydes & Ketones: • Aldol Condensation — two carbonyl compounds → β-hydroxy carbonyl compound • Cannizzaro Reaction — aldehydes without α-H → disproportionation (alcohol + acid) • Clemmensen Reduction — C=O → CH₂ using Zn/Hg + HCl • Wolf-Kishner Reduction — C=O → CH₂ using NH₂NH₂ + KOH • Tollens Test — Ag mirror test for aldehydes • Fehling Test — Cu²⁺ → Cu₂O (brick red) for aldehydes
Alcohols & Phenols: • Lucas Test — ZnCl₂ + HCl, turbidity order: 3°>2°>1° • Victor Meyer Test — distinguishes 1°, 2°, 3° alcohols • Kolbe Reaction — phenol + CO₂ → salicylic acid • Reimer-Tiemann Reaction — phenol + CHCl₃ + NaOH → ortho-hydroxy benzaldehyde
Amines: • Sandmeyer Reaction — diazonium salt → aryl halide using CuCl/CuBr/CuCN • Balz-Schiemann Reaction — diazonium salt → aryl fluoride using HBF₄ • Hinsberg Test — distinguishes 1°, 2°, 3° amines • Gabriel Phthalimide Synthesis — preparation of primary amines
Hydrocarbons: • Wurtz Reaction — alkyl halide + Na → alkane • Fittig Reaction — aryl halide + Na → biaryl • Wurtz-Fittig Reaction — alkyl halide + aryl halide + Na → alkyl arene • Friedel-Crafts Alkylation — benzene + RCl → alkylbenzene (AlCl₃) • Friedel-Crafts Acylation — benzene + RCOCl → aryl ketone (AlCl₃)
Other Important: • Diels-Alder Reaction — diene + dienophile → cyclohexene • Baeyer's Test — purple KMnO₄ decolourises → unsaturation present • Lassaigne Test — sodium fusion test for N, S, halogens in organic compounds
⚗️ Physical Chemistry Formulas — Must Memorise
Not all formulas in the syllabus are equally important. Based on NEET PYQ analysis from 2016–2025, certain formulas appear 3–6 times repeatedly — focus only on these.
Mole Concept: Moles = Mass / Molar Mass Moles = Volume at STP / 22.4 Moles = Number of particles / 6.022 × 10²³ Molarity = Moles of solute / Volume of solution (L)
Thermodynamics: ΔG = ΔH - TΔS ΔG° = -RT ln K ΔH = ΔU + ΔngRT Cp - Cv = R
Chemical Equilibrium: Kp = Kc(RT)^Δn pH = -log[H⁺] pOH = -log[OH⁻] pH + pOH = 14 Ka × Kb = Kw = 10⁻¹⁴
Electrochemistry: E°cell = E°cathode - E°anode ΔG° = -nFE°cell Nernst: E = E° - (RT/nF) ln Q w = ZIt (Faraday's law)
Chemical Kinetics: Rate = k[A]^m [B]^n t½ = 0.693/k (first order) k = 2.303/t × log(a/a-x)
Solutions: ΔTb = Kb × m ΔTf = Kf × m π = MRT (van't Hoff)
🔑 Inorganic Chemistry — NCERT is Everything
For Inorganic Chemistry, master NCERT for both inorganic and organic chemistry basics. Most questions come from NCERT, either directly or indirectly.
What to revise right now:
p-Block Elements: • Oxides of nitrogen — NO, NO₂, N₂O, N₂O₅ — properties and uses • Oxoacids of phosphorus — H₃PO₃, H₃PO₄ — basicity • Allotropes of sulphur and carbon • Interhalogen compounds — ClF, ClF₃, ClF₅
Coordination Compounds: • IUPAC naming rules — practice 5 examples • Crystal Field Theory — octahedral vs tetrahedral splitting • Colour, magnetism, stability — learn all in one table • EAN rule and Werner's theory
d & f Block: • Electronic configurations of Cr and Cu — exceptions • Oxidation states of Mn — +2 to +7 • KMnO₄ reactions in acidic, basic, neutral medium
⚡ Today's Study Plan — June 16
Morning (2 hours): All named reactions — write each one once. Focus on Aldehydes, Ketones, Amines reactions. Afternoon (2 hours): Physical Chemistry formulas — write and memorise. Solve 20 numerical problems: Thermodynamics + Electrochemistry. Evening (1 hour): 45 Chemistry MCQs — timed (45 seconds each). Take free Chemistry diagnostic on The Examiner.
👉 Take Free Chemistry Mock Test — theexaminer.in
❌ What NOT to Do Today
• Do not read mechanisms in detail — only know the name, reactant, and product • Do not skip Physical Chemistry numericals — 2 marks each • Do not start new Inorganic topics — NCERT revision only • Do not spend more than 4 hours on Chemistry
💬 Final Word
Chemistry rewards students who are systematic. Chemistry is often considered the easiest-scoring subject in NEET. Questions are generally direct and based on standard concepts, especially from Organic and Inorganic Chemistry.
Five days. 180 marks. Master your named reactions today and take a mock test tonight.
👉 Free Re-NEET 2026 Mock Test — theexaminer.in
Tags: Re-NEET 2026 Chemistry, NEET Chemistry named reactions, NEET Chemistry formula list 2026, NEET Organic Chemistry June 21, NEET Chemistry important chapters 2026