Alcohols, Phenols and Ethers mein preparation, acidity order aur name reactions aate hain. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.
Important Formulas & Concepts — Alcohols, Phenols and Ethers
- Hydration: alkene + H₂O/H⁺ → alcohol (Markovnikov)
- Hydroboration-oxidation: anti-Markovnikov alcohol
- Lucas test: 3° turant, 2° 5 min, 1° no reaction (room temp)
- Acidity: phenol > water > alcohol; o/p-nitrophenol aur zyada acidic
- Kolbe reaction: phenol + CO₂/NaOH → salicylic acid
- Reimer-Tiemann: phenol + CHCl₃/NaOH → salicylaldehyde
- Williamson synthesis: R−X + R′ONa → R−O−R′ (SN2, 1° halide lo)
- Oxidation: 1° → aldehyde (PCC) → acid; 2° → ketone
Quick Revision Points
- Phenol ki acidity resonance-stabilised phenoxide se
- EWG (NO₂) acidity badhate hain, EDG (CH₃) ghatate hain
- Williamson mein 3° halide loge to elimination ho jayegi
- Dehydration ease: 3° > 2° > 1°
- Iodoform test: CH₃−CH(OH)− group wale alcohols positive
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FAQ
Name reactions kitni hain is chapter mein?
Kolbe, Reimer-Tiemann, Williamson core hain — PDF ke reaction map mein sab ek saath.
Acidity order ke questions?
Comparison-based MCQs aate hain — PDF mein reasoning ke saath orders diye hain.
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