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Alcohols, Phenols and Ethers

Kerala Board · Class 12 · Chemistry

Quick revision notes for Alcohols, Phenols and Ethers — Kerala Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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A reaction scheme showing the hydroboration-oxidation of an alkene (e.g., propene) to form an alcohol, highlighting the anti-Markownikov addition.
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Key Topics to Revise

1

Classification and Nomenclature

  • Alcohols classified as 1°, 2°, 3° based on carbon attached to -OH group
  • Monohydric (1 -OH), dihydric (2 -OH), trihydric (3 -OH) alcohols
  • IUPAC naming: Replace 'e' of alkane with 'ol', number from -OH end
2

Preparation Methods

  • Alcohols from alkenes: (i) Acid-catalyzed hydration (Markovnikov) (ii) Hydroboration-oxidation (anti-Markovnikov)
  • Alcohols from carbonyl compounds: Reduction using H₂/Ni, NaBH₄, LiAlH₄
  • Alcohols from Grignard reagents: HCHO → 1° alcohol, RCHO → 2° alcohol, R₂CO → 3° alcohol
3

Physical Properties

  • Hydrogen bonding increases boiling points: alcohols > ethers > alkanes of similar mass
  • Solubility in water decreases with increasing carbon chain length
  • Lower alcohols (C₁-C₃) completely miscible with water
4

Chemical Reactions - Alcohols

  • O-H bond cleavage: (i) Reaction with metals → alkoxides + H₂ (ii) Esterification with acids
  • C-O bond cleavage: (i) With HX → alkyl halides (Lucas test) (ii) Dehydration → alkenes
  • Oxidation: 1° alcohols → aldehydes → carboxylic acids; 2° alcohols → ketones; 3° alcohols resistant

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Full Notes

Key Concepts

Alcohols containAlcohols are prepared byAlcohols and phenols form intermolecular hydrogenPhenols are more acidic than alcoholsAlcohols undergo SN2 reactions with HX

Frequently Asked Questions

What are the important topics in Alcohols, Phenols and Ethers for Kerala Board Class 12 Chemistry?
Alcohols, Phenols and Ethers covers several key topics that are frequently asked in Kerala Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Alcohols, Phenols and Ethers — Kerala Board Class 12 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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