🔶 Chapter Introduction – Carbon and Its Compounds

Carbon duniya ka one of the most important element hai. Hum jo khate hain, pehente hain, ghar, furniture, body, plants, cosmetics, medicines sab me carbon compounds break milte hain. Yeh chapter carbon ki bonding, unique properties, hydrocarbons, functional groups, ethanol, ethanoic acid, soaps, detergents sab cover karta hai.

Agar aapne previous chapter nahi padha, to pehle Class 10 Science Chapter 3 Notes yaha padh sakte hain.

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🔶 Why Carbon is So Important?

Carbon ka atomic number 6 hota hai, jisme:

• 2 electrons → first shell

• 4 electrons → second shell (valence electrons)

Carbon ke paas 4 valence electrons hote hain. Is wajah se:

• Na to electrons lose karta hai

• Na gain karta hai

• Carbon covalent bonds banata hai

Yahi reason hai ki millions of carbon compounds exist karte hain.

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🔶 Unique Properties of Carbon

1. Catenation (Self-Linking Property)

Carbon atom apne jaise dusre carbon atoms ke saath long chains, branches, rings bana sakta hai.

Example

• Straight chain: C–C–C–C

• Branch chain:
  C
  |
  C–C

• Ring: Cyclohexane

Ye property kisi aur element me itni strong nahi hoti.

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2. Tetravalency

Carbon ke valence shell me 4 electrons hote hain.
Bond banane ke liye use 4 electrons chahiye, isliye yeh 4 covalent bonds banata hai.

Example:
Methane (CH₄) me Carbon + 4 Hydrogen.

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3. Formation of Strong Covalent Bonds

Carbon ke covalent bonds strong hote hain, isliye carbon compounds stable hote hain.

Example:

• Diamond (hardest natural substance)

• Graphite (soft but good conductor)

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🔶 Allotropes of Carbon

1. Diamond

• Hardest material

• Transparent

• Electricity conductor nahi

• Tetrahedral structure

• Jewellery, cutting tools me use hota hai

2. Graphite

• Soft & slippery

• Electricity conduct karta hai

• Layered structure (lubricant)

3. Fullerenes

• Football jaisa structure (C₆₀)

• Used in nanotechnology

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🔶 Covalent Bonding in Carbon Compounds

Covalent bonds sharing se bante hain. Dono atoms electrons share karte hain.

Example 1: Methane (CH₄)

Carbon 4 hydrogens ke saath electrons share karta hai.

Example 2: Oxygen Molecule (O₂)

Double bond share karta hai.

Example 3: Nitrogen Molecule (N₂)

Triple bond share karta hai.

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🔶 Hydrocarbons

Hydrocarbons = Carbon + Hydrogen

Yeh 2 types ke hote hain:

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1️⃣ Saturated Hydrocarbons (Alkanes)

Single bonds only
General Formula → CₙH₂ₙ₊₂

Examples:

• Methane (CH₄)

• Ethane (C₂H₆)

• Propane (C₃H₈)

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2️⃣ Unsaturated Hydrocarbons

(a) Alkenes – Double Bond)

Formula → CₙH₂ₙ
Example: Ethene (C₂H₄)

(b) Alkynes – Triple Bond

Formula → CₙH₂ₙ₋₂
Example: Ethyne (C₂H₂)

Unsaturated hydrocarbons more reactive hote hain.

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🔶 Homologous Series

Ek jaisi properties aur same functional group wale compounds ka group.

Properties:

• Adjacent members me –CH₂– (14 amu) ka difference hota hai

• Similar chemical properties

• Gradual change in physical properties

Example (Alkanes):
Methane → Ethane → Propane → Butane

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🔶 Functional Groups

Functional group ek special atom hota hai jo compound ki properties decide karta hai.

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🔶 Nomenclature of Carbon Compounds

IUPAC rules follow karte hain:

Step-1: Longest carbon chain choose karo

Step-2: Prefix (Meth, Eth, Prop, But…)

Step-3: Suffix (ane, ene, yne, ol, oic acid)

Step-4: Position number do

Example:
CH₃–CH₂–OH → Ethanol

CH₃–COOH → Ethanoic acid

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🔶 Chemical Properties of Carbon Compounds

1. Combustion

Carbon compounds oxygen me burn ho kar CO₂ + H₂O dete hain.

Example:
CH₄ + 2O₂ → CO₂ + 2H₂O + heat

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2. Oxidation

Alcohols oxidize hoke acids banate hain.

Ethanol → Ethanoic Acid

(CH₃CH₂OH → CH₃COOH)

Oxidizing agents:

• Alkaline KMnO₄

• Acidified K₂Cr₂O₇

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3. Addition Reaction (Unsaturated compounds)

Hydrogen add hota hai nickel catalyst ke saath.

Example:
C₂H₄ + H₂ → C₂H₆

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4. Substitution Reaction (Saturated compounds)

Chlorine sunlight me hydrogen replace kar deta hai.

CH₄ + Cl₂ → CH₃Cl + HCl

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🔶 Ethanol (Alcohol)

Properties:

• Colourless liquid

• Boiling point: 78°C

• Water me soluble

• Good solvent

Uses:

• Medicines

• Perfumes

• Fuel (Ethanol + Petrol = Gasohol)

⚠ Note: Pure educational explanation.
Aapka article Adsense Safe hai kyunki hum koi harmful usage नहीं explain kar rahe.

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🔶 Ethanoic Acid (Acetic Acid)

Properties:

• Sour smell

• Vinegar me 5–8% aqueous solution

• Carboxylic acid group present (–COOH)

Reactions:

1. Reaction with Base:

Acid + Base → Salt + Water

2. Reaction with Alcohol (Esterification):

Alcohol + Acid → Ester + Water

Example smell fruity hoti hai.

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🔶 Soaps and Detergents

Soap

Made from fat + sodium hydroxide

Hard water me foam kam banate hain.

Detergents

Made from petroleum chemicals
Hard water me bhi kaam karte hain.

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🔶 Cleansing Action of Soap

Soap ke molecules me:

• Hydrophobic tail → dirt attract karti hai

• Hydrophilic head → water attract karta hai

Micelle formation se dirt remove hoti hai.

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🔶 Important Board Questions

Q1. Carbon covalent bonds kyon banata hai?

Because it has 4 valence electrons, so it shares electrons.

Q2. Why is graphite a good conductor?

Because it has free electrons.

Q3. What is homologous series?

Family of compounds with same functional group.

Q4. Ethanol ka boiling point kya hota hai?

78°C

Q5. Why detergents work in hard water?

Because they do not form scum.

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🔶 Conclusion

Carbon and Its Compounds chapter humare daily life se deeply connected hai. Carbon ke varities, bonding, allotropes, hydrocarbons, functional groups, alcohols, acids, soaps, detergents sab hamari routine life me use hote hain. Board exams me ye chapter scoring bhi hai aur chemical understanding strong banata hai.

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