Alcohols, Phenols and Ethers
Telangana Open School (TOSS) · Class 12 · Chemistry
Complete topic list for Alcohols, Phenols and Ethers in Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Alcohols, Phenols and Ethers
Classification and Nomenclature of Alcohols
- Alcohols are classified as primary (1°), secondary (2°), or tertiary (3°) based on the number of alkyl groups attached to the carbon bearing the -OH group.
- Primary alcohols have one alkyl group, secondary have two, and tertiary have three.
- IUPAC names of alcohols end with '-ol'. The longest carbon chain containing the -OH group is selected, and numbering starts from the end nearest to the -OH group.
Preparation of Alcohols
- Haloalkanes undergo hydrolysis with aqueous KOH or NaOH to form alcohols.
- Alkenes undergo acid-catalyzed hydration following Markovnikov’s rule to give alcohols.
- Oxymercuration-demercuration gives Markovnikov addition without rearrangement.
Physical Properties and Reactions of Alcohols
- Alcohols have higher boiling points than alkanes and haloalkanes due to intermolecular hydrogen bonding.
- Lower alcohols are soluble in water due to H-bonding with water molecules.
- Alcohols act as weak acids and form alkoxides with active metals like Na or K.
Phenols: Nomenclature, Preparation, and Reactions
- Phenol is C₆H₅OH; the -OH group is directly attached to the benzene ring.
- IUPAC naming uses 'phenol' as parent; substituents are numbered relative to -OH.
- Prepared in lab by hydrolysis of diazonium salts or alkali fusion of benzenesulphonate.
Key Concepts
Central concept: Alcohols, Phenols and Ethers
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