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🧪 **Hybridization & Molecular Geometry**: **Hybridization** is the mixing of atomic orbitals of comparable energy to for...
25/09/2026

🧪 **Hybridization & Molecular Geometry**: **Hybridization** is the mixing of atomic orbitals of comparable energy to form equivalent **hybrid orbitals**, which help explain molecular shape and bonding. Molecular geometry depends mainly on the number of **bond pairs and lone pairs** around the central atom according to VSEPR theory.

📌 **Key Examples:**
• **sp → Linear → BeCl₂ → 180°**
• **sp² → Trigonal planar → BF₃ → 120°**
• **sp³ → Tetrahedral → CH₄ → 109.5°**
• **sp³ → Trigonal pyramidal → NH₃ → 107°**
• **sp³ → Bent → H₂O → 104.5°**
• **sp³d → Trigonal bipyramidal → PCl₅ → 90°, 120°**
• **sp³d² → Octahedral → SF₆ → 90°**

🔑 **Remember:** Lone pairs occupy more space than bond pairs and generally **decrease bond angles**.

25/09/2026

🧪 **Reimer-Tiemann Reaction**: The Reimer-Tiemann reaction is a **name reaction of phenols** in which **phenol reacts with chloroform (CHCl₃) and aqueous NaOH/KOH** to introduce a **–CHO group** mainly at the **ortho position**, forming **salicylaldehyde** after hydrolysis.

📌 **Key Points:**
• Reactant: **Phenol + CHCl₃**
• Base: **NaOH / KOH**
• Reagent generates **dichlorocarbene (:CCl₂)**
• Major product: **o-Hydroxybenzaldehyde (Salicylaldehyde)**
• Minor product: **p-Hydroxybenzaldehyde**

🔑 **Reaction:**
**Phenol + CHCl₃ + NaOH → o-Hydroxybenzaldehyde**

EARTH’S MAGNETISM | STUDY NOTES 📚Explore the magnetic nature of our planet with these quick, exam-focused study notes! L...
25/09/2026

EARTH’S MAGNETISM | STUDY NOTES 📚

Explore the magnetic nature of our planet with these quick, exam-focused study notes! Learn about Earth’s magnetic field, magnetic elements, magnetic poles, declination, inclination (dip), and horizontal component in an easy-to-revise format. ⚡🔬

Perfect for Class 12 Physics • NEET • JEE • Board Exams 🎯

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🧪 **Cannizzaro Reaction**: Cannizzaro reaction is a **disproportionation reaction** shown by **aldehydes that do not con...
25/09/2026

🧪 **Cannizzaro Reaction**: Cannizzaro reaction is a **disproportionation reaction** shown by **aldehydes that do not contain α-hydrogen** in the presence of a **concentrated alkali** such as NaOH or KOH. Two molecules of the aldehyde undergo simultaneous **oxidation and reduction** to form a **carboxylate salt and an alcohol**.

📌 **General Reaction:**
**2 RCHO + NaOH → RCOONa + RCH₂OH**

🔑 **Example:**
**2 C₆H₅CHO + NaOH → C₆H₅COONa + C₆H₅CH₂OH**
Benzaldehyde → Sodium benzoate + Benzyl alcohol

• Requires **no α-hydrogen**
• Uses **concentrated base**
• One molecule is **oxidized**, the other is **reduced**

🧪 **E° and Electrochemical Series (ECS)**: **Standard electrode potential (E°)** is the potential of an electrode measur...
25/09/2026

🧪 **E° and Electrochemical Series (ECS)**: **Standard electrode potential (E°)** is the potential of an electrode measured under standard conditions relative to the **standard hydrogen electrode (SHE)**, whose E° is defined as **0.00 V**. The **Electrochemical Series (ECS)** arranges electrodes according to their standard reduction potentials. A **more positive E°** indicates a greater tendency to undergo **reduction**, while a **more negative E°** indicates a greater tendency to undergo **oxidation** in the reverse direction.

📌 **Key Points:**
• Reference electrode: **SHE = 0.00 V**
• More positive E° → stronger **oxidizing agent**
• More negative E° → stronger **reducing agent**
• ECS is arranged according to **standard reduction potentials**
• **E°cell = E°cathode − E°anode**

24/09/2026

Basic 30 elements electronic configuration
Most important

🧪 **Aldol Condensation Reaction**: Aldol condensation is a reaction of **aldehydes or ketones containing at least one α-...
24/09/2026

🧪 **Aldol Condensation Reaction**: Aldol condensation is a reaction of **aldehydes or ketones containing at least one α-hydrogen** in the presence of a **dilute acid or base**. It initially forms a **β-hydroxy carbonyl compound (aldol)**, which on heating undergoes **dehydration** to give an **α,β-unsaturated carbonyl compound**.

📌 **Example:**
**2 CH₃CHO → CH₃CH(OH)CH₂CHO → CH₃CH=CHCHO + H₂O**
Acetaldehyde → β-Hydroxy aldehyde → Crotonaldehyde

🔑 **Key Point:**
**α-H carbonyl compound → Aldol → Dehydration → α,β-unsaturated carbonyl compound**

🧬 **Raffinose**: Raffinose (**C₁₈H₃₂O₁₆**) is a **trisaccharide** composed of **galactose + glucose + fructose**. It is ...
24/09/2026

🧬 **Raffinose**: Raffinose (**C₁₈H₃₂O₁₆**) is a **trisaccharide** composed of **galactose + glucose + fructose**. It is found in **beans, peas, cabbage, broccoli, and some other vegetables**. Raffinose is a **non-reducing sugar** and is hydrolysed by **α-galactosidase** into sucrose and galactose.

📌 **Key Points:**
• Formula: **C₁₈H₃₂O₁₆**
• Type: **Trisaccharide**
• Components: **Galactose + Glucose + Fructose**
• Commonly found in: **Legumes & vegetables**
• **Non-reducing sugar**
• Hydrolysed by: **α-Galactosidase**

NUCLEAR FISSION vs NUCLEAR FUSION ⚛️📚Two important nuclear reactions, one major difference in how energy is released!🔹 N...
24/09/2026

NUCLEAR FISSION vs NUCLEAR FUSION ⚛️📚

Two important nuclear reactions, one major difference in how energy is released!

🔹 Nuclear Fission: A heavy nucleus splits into smaller nuclei, releasing a large amount of energy.
🔹 Nuclear Fusion: Two light nuclei combine to form a heavier nucleus and release enormous energy.
🔹 Fission → Nuclear reactors ⚡
🔹 Fusion → Powers the Sun & stars ☀️

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📌 Save for revision | 🔄 Share with your study partner | ❤️ Follow for more Physics & Chemistry Study Notes!

24/09/2026

🧬 **Sucrose**: Sucrose (**C₁₂H₂₂O₁₁**) is a **disaccharide** commonly known as **table sugar**. It is composed of **glucose + fructose** units linked by an **α(1→2)β glycosidic bond**. Sucrose is a **non-reducing sugar** because both anomeric carbons are involved in the glycosidic linkage. On hydrolysis, it produces **glucose and fructose**.

📌 **Key Points:**
• Formula: **C₁₂H₂₂O₁₁**
• Type: **Disaccharide**
• Components: **Glucose + Fructose**
• Linkage: **α(1→2)β**
• Common name: **Table sugar / cane sugar**
• **Non-reducing sugar**

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