हिंदी

Overview of Alcohols, Phenols and Ethers

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Estimated time: 21 minutes
Maharashtra State Board: Class 12

Definition: Ethers

Compounds containing an oxygen atom bonded to two alkyl or aryl groups are called ethers.

Maharashtra State Board: Class 12

Definition: Enantiomers

Two non-superimposable mirror image structures are called enantiomers.

Maharashtra State Board: Class 12

Definition: Optical activity

The property of a substance to rotate the plane of plane-polarized light is called optical activity.

Maharashtra State Board: Class 12

Definition: Plane polarized light

Light vibrating in only one plane perpendicular to the direction of propagation is called plane polarized light.

Maharashtra State Board: Class 12

Definition: Racemic mixture

An equimolar mixture of two enantiomers that shows no optical rotation is called a racemic mixture.

Maharashtra State Board: Class 12

Definition: Esterification

The reaction in which an alcohol reacts with a carboxylic acid to form an ester is called esterification.

Maharashtra State Board: Class 12

Definition: Reimer–Tiemann reaction

The reaction in which phenol is treated with chloroform and aqueous sodium hydroxide followed by acidification to form salicylaldehyde is called Reimer–Tiemann reaction.

Maharashtra State Board: Class 12

Definition: Kolbe’s reaction

The reaction in which sodium phenoxide reacts with carbon dioxide under pressure followed by acidification to form salicylic acid is called Kolbe’s reaction.

Maharashtra State Board: Class 12

Key Points: Nomenclature

Category Naming System Rule Common Name IUPAC Name
Alcohol Common system Alkyl group name followed by alcohol Methyl alcohol Methanol
Alcohol Carbinol system Considered as derivative of methyl alcohol (carbinol) Ethyl carbinol Propan-1-ol
Alcohol IUPAC system Replace ‘e’ of parent alkane with ‘ol’ and assign position number sec-Butyl alcohol Butan-2-ol
Phenol Common system Ortho/meta/para prefixes used for substitution o-Cresol 2-Methylphenol
Phenol IUPAC system Named as substituted benzene with suffix –ol Catechol Benzene-1,2-diol
Ether Common system Names of alkyl groups arranged alphabetically followed by ether Ethyl methyl ether Methoxyethane
Ether Common name (aromatic) Accepted trivial name used Anisole Methoxybenzene
Maharashtra State Board: Class 12

Key Points: Uses of Alcohols, Phenols and Ethers

Category Substance Use Additional Information
Alcohol Methyl alcohol Used as solvent Applied in paints and varnishes
Ethyl alcohol Used as antifreeze Used in automobile radiators and as solvent
Phenol Phenol Manufacture of resin Used to prepare phenol–formaldehyde resin (Bakelite)
Phenolic compounds Antiseptic purpose Present in mouthwash, deodorants and cleaners
Ether Diethyl ether General anaesthetic Earlier used in surgical operations
Diethyl ether Industrial solvent Used for Grignard reagents, fats, waxes and oils
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