Phenols. Definition: When the hydroxyl group (-OH) is attached to an aromatic ring, it is called P henol. Nomenclature of Phenols: The nomenclature of the phenol is done by two methods. 1) Simple method 2) Numbering method.
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When the hydroxyl group (-OH) is attached to an aromatic ring, it is called Phenol.
The nomenclature of the phenol is done by two methods.
1) Simple method
2) Numbering method
Simple method : In this method the substituent attached on the aromatic ring with respect to -OH group is designated as ortho, meta, para as prefix to the name of phenol.
Methyl phenols are often called Cresols.
Numbering method: In this method, the carbon atom of the aromatic ring to which -OH group is attached is given number 1. Then the carbon atom of the ring to which the other substituent is attached is given lowest possible number.
If more than two group are attached to the aromatic ring, only number method is used to indicate their relative position w.r.t. –OH group