Carbon aur uske yougik notes Class 10 ke sabse important chapters mein se ek hai — NCERT Science ka Chapter 4. Is chapter se board exam mein har saal 5-8 marks ke questions aate hain. Yahan covalent bandh, hydrocarbon, functional groups, ethanol, ethanoic acid aur sabun-detergent — sab kuch simple Hindi mein, exam-oriented tarike se samjhaya gaya hai.
Carbon Ki Do Khaas Shaktiyan
Carbon ka atomic number 6 hai aur uska electronic configuration 2,4 hai — matlab uske bahari shell mein 4 electrons hain. Noble gas jaisi stable configuration pane ke liye carbon apne 4 valence electrons ko dusre parmanuon ke saath share karta hai. Is sharing wale bandh ko covalent bandh (sah-sanyojak bandh) kehte hain.
Carbon ke laakhon yougik hone ki do wajah hain:
- Catenation (shrinkhala banane ki kshamata): Carbon apne hi parmanuon se judkar lambi-lambi shrinkhalayen, shakhaen aur rings bana sakta hai.
- Tetravalency (chatur-sanyojakta): Carbon hamesha 4 bandh banata hai — chahe single, double ya triple bandh ho.
Carbon ke inhi do guno ki wajah se carbon aur uske yougik notes har saal board exam mein puche jate hain.
Covalent Bandh (Sah-Sanyojak Bandh) Kya Hai?
Jab do parmanu electrons ka sajha karke noble gas configuration hasil karte hain, to banta hai covalent bandh.
- Single bond (ekal bandh): 1 electron pair share — jaise H2, CH4 (methane)
- Double bond (dvi bandh): 2 electron pairs share — jaise O2, C2H4 (ethene)
- Triple bond (tri bandh): 3 electron pairs share — jaise N2, C2H2 (ethyne)
Methane (CH4) mein carbon apne 4 electrons 4 hydrogen parmanuon ke saath share karta hai — 4 single covalent bonds.
Covalent Yougikon Ke Gun (Yaad Rakhne Layak)
- Inke melting aur boiling points kam hote hain (molecules ke beech kamzor aakarshan).
- Ye bijli ke kharab conductor hote hain (koi free ions ya electrons nahi).
- Paani mein ghulansheel nahi, lekin organic solvents mein ghul jate hain.
Santript Aur Asantript Hydrocarbon
Sirf carbon aur hydrogen se bane yougikon ko hydrocarbon kehte hain.
- Santript (saturated): Carbon-carbon ke beech sirf single bond — Alkane, formula CnH2n+2. Example: methane (CH4), ethane (C2H6), propane (C3H8).
- Asantript (unsaturated): Double ya triple bond wale — Alkene (CnH2n, jaise ethene C2H4) aur Alkyne (CnH2n-2, jaise ethyne C2H2).
- Chakreeya (cyclic): Ring structure — cyclohexane (C6H12), benzene (C6H6).
Shakha wale yougik: Butane (C4H10) do roopon mein milta hai — seedhi chain (n-butane) aur shakha wali chain (iso-butane). Ye structural isomers kehlate hain.
Functional Groups Aur Naamkaran
Carbon chain se juda woh parmanu ya samooh jo yougik ke gun tay karta hai, functional group (karyatmak samooh) kehlata hai.
| Functional group | Suffix/Prefix | Example |
|---|---|---|
| -Cl, -Br (halo) | chloro-, bromo- (prefix) | Chloropropane |
| -OH (alcohol) | -ol | Propanol |
| -CHO (aldehyde) | -al | Propanal |
| >C=O (ketone) | -one | Propanone |
| -COOH (carboxylic acid) | -oic acid | Propanoic acid |
Naamkaran ke niyam:
- Sabse lambi carbon chain chunein.
- Chain ko is tarah number dein ki functional group ko sabse chhota number mile.
- Suffix ya prefix jodkar naam banayein — jaise 2 carbon + alcohol = ethanol.
Homologous Series (Samajaateeya Shreni)
Ek hi functional group wale yougikon ki aisi series jismein lagatar do sadasyon mein -CH2- ka antar ho aur mass ka antar 14 u ho, homologous series kehlati hai.
- Example: CH4, C2H6, C3H8, C4H10 (alkanes)
- Example: CH3OH, C2H5OH, C3H7OH, C4H9OH (alcohols)
Series mein upar se neeche jane par physical properties mein kramik badlav (gradation) dikhta hai.
Carbon Yougikon Ke Rasayanik Gun
1. Dahan (Combustion)
Carbon aur uske yougik jalne par CO2, paani, taap aur prakash dete hain:
CH4 + 2O2 → CO2 + 2H2O + taap aur prakash
- Santript hydrocarbon saaf neeli lau se jalte hain.
- Asantript hydrocarbon peeli lau aur kala dhuan (soot) dete hain.
2. Oksikaran (Oxidation)
Ethanol ko alkaline KMnO4 ya acidified K2Cr2O7 ke saath garam karne par ethanoic acid banta hai:
CH3-CH2OH → CH3COOH (oxidising agent + heat)
3. Yog Abhikriya (Addition Reaction)
Asantript hydrocarbon Ni ya Pd catalyst ki maujoodgi mein hydrogen jodkar santript ban jate hain:
Ethene + H2 → Ethane
Isi process se vanaspati tel (asantript) ko vanaspati ghee (santript) mein badla jata hai. Dhyan rahe — pashu charbi mein santript fatty acids hote hain, jo sehat ke liye hanikarak mane jate hain.
4. Pratisthapan Abhikriya (Substitution Reaction)
Santript hydrocarbon aam taur par akriyasheel hote hain, lekin suraj ki roshni mein chlorine ke saath pratisthapan karte hain:
CH4 + Cl2 → CH3Cl + HCl (sunlight mein)
Ethanol (C2H5OH) — Mahatvapurna Yougik
- Kamre ke taapman par drav hai; boiling point 351 K (78°C).
- Achha solvent hai — dawaiyon (tincture iodine, cough syrup) aur petrol mein additive ke roop mein istemal.
- Sodium ke saath reaction: 2C2H5OH + 2Na → 2C2H5O⁻Na⁺ + H2 (hydrogen gas nikalti hai).
- Conc. H2SO4 ke saath 443 K par garam karne par ethene banta hai (nirjalikaran).
- Denatured alcohol: Ethanol mein methanol jaisa zehreela padarth milakar ise peene layak nahi rakha jata.
- Zyada matra mein sharab ka sevan liver ko nuksan pahunchata hai.
Ethanoic Acid (CH3COOH)
- Boiling point 391 K (118°C), melting point 290 K (17°C) — thand mein jam jata hai, isliye glacial acetic acid kehlata hai.
- Sirka (vinegar) iska 5-8% jaleeya vilayan hai — achaar mein preservative ke roop mein.
- Pehchan: NaHCO3 ya Na2CO3 milane par tez bulbule ke saath CO2 nikalti hai, jo choone ke paani ko doodhiya kar deti hai.
- Esterification: Acid + alcohol → ester (meethi khushboo) + paani (conc. H2SO4 catalyst). Iska ulta — ester + NaOH → sabun — saponification kehlata hai.
- Reactions: 2CH3COOH + 2Na → 2CH3COONa + H2; CH3COOH + NaOH → CH3COONa + H2O.
Sabun Aur Detergent — Safai Kaise Hoti Hai?
Sabun lambe chain wale carboxylic acids (jaise stearic acid) ke sodium ya potassium lavan hote hain. Sabun ke molecule ke do hisse hote hain:
- Hydrophilic head (jal-snehi): Ionic hissa, paani ki taraf khinchtata hai.
- Hydrophobic tail (jal-virodhi): Lambi hydrocarbon chain, tel/grease ki taraf.
Paani mein sabun ke molecules micelle namak gucchhe banate hain — tail andar tel/mitti mein, head bahar paani mein. Is tarah mitti kapde se alag hokar paani mein tairne lagti hai aur dhul jati hai.
Hard water mein Ca2+ aur Mg2+ ions sabun ke saath aghulansheel scum banate hain — isliye hard water mein sabun achhe jhaag nahi deta. Detergent (lambe chain carboxylic acids ke ammonium ya sulphonate lavan) hard water mein scum nahi banate, isliye wahan behtar safai karte hain.
Carbon Aur Uske Yougik Notes: Quick Revision Table
| Topic | Yaad rakhne wali baat |
|---|---|
| Carbon ka configuration | 2,4 — tetravalent |
| Alkane / Alkene / Alkyne | CnH2n+2 / CnH2n / CnH2n-2 |
| Alcohol / Aldehyde / Ketone / Acid | -ol / -al / -one / -oic acid |
| Homologous antar | -CH2-, 14 u |
| Ethanol ka BP | 351 K |
| Ethanoic acid ka MP | 290 K (glacial) |
| Sabun | Na/K lavan, micelle se safai |
| Vinegar | 5-8% acetic acid |
Umeed hai ye carbon aur uske yougik notes aapki taiyari mein kaam aayenge. Aur study notes ke liye dekhein: https://jagatindia.com/category/students/