Classification of Alcohols and Phenols
− Classification of Alcohols
On the basis of type of chain
When the hydroxyl group (-OH group) of an alcohol is attached to an aliphatic carbon chain (open chain), the alcohol is called an aliphatic alcohol.
When the hydroxyl group is attached to the carbon chain which is attached to an aromatic ring, the alcohol is known as aromatic alcohol.
−Classification of Alcohols
On the basis of number of hydroxyl groups present
Monohydric, dihydric, trihydric and polyhydric alcohols contain 1, 2, 3 and many alcohols respectively.
−Classification of Alocohols
As primary, secondary and tertiary alcohols
If the hydroxyl group is attached to a primary carbon, it is called primary alcohol. Similarly, secondary and tertiary alcohols are attached to secondary and tertiary carbons respectively.
Primary alcohol (1°)
Secondary alcohol (2°)
Tertiary alcohol (3°)
Classification of Phenols
Phenols are classified as monohydric, dihydric, trihydric, polyhydric etc.
Question : Classify the following as primary, secondary and tertiary alcohols
Answer : The answer is written in the following table :