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Classification of Alcohols, Phenols and Ethers

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Classification of Alcohols, Phenols and Ethers

Classification of Alcohols

Based on number of —OH groups

Type —OH Groups Example
Monohydric 1 Ethanol (CH₃CH₂OH)
Dihydric 2 Ethylene glycol (CH₂OH–CH₂OH)
Trihydric 3 Glycerol
Polyhydric More than 3 Glucose

Based on hybridisation of carbon bearing —OH (Monohydric only):

Type Description Example
Primary (1°) —OH on primary carbon R–CH₂–OH
Secondary (2°) —OH on secondary carbon R–CH(OH)–R
Tertiary (3°) —OH on tertiary carbon R–C(OH)(R)–R
Allylic —OH on sp³ carbon next to C=C CH₂=CH–CH₂OH
Vinylic —OH directly on sp² carbon of C=C CH₂=CH–OH
Benzylic —OH on sp³ carbon next to aromatic ring C₆H₅–CH₂–OH

Classification of Phenols

Type —OH Groups Example
Monohydric 1 Phenol
Dihydric 2 Catechol (Benzene-1,2-diol)
Trihydric 3 Phloroglucinol (Benzene-1,3,5-triol)

Classification of Ethers

Type Description Example
Simple / Symmetrical Same alkyl/aryl groups on both sides of O CH₃–O–CH₃ (Dimethyl ether), C₆H₅–O–C₆H₅ (Diphenyl ether)
Mixed / Unsymmetrical Different alkyl/aryl groups on both sides of O CH₃–O–C₂H₅ (Ethyl methyl ether), C₂H₅–O–C₆H₅ (Ethyl phenyl ether)
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