Phenol = carbolic acid, benzenol, phenylic acid, hydroxybenzene and phenic acid.

Other names for phenol include carbolic acid, benzenol, phenylic acid, hydroxybenzene and phenic acid.

The molecular formula for phenol or carbolic acid is C₆H₅OH. Sometimes the term 'phenol' is applied to any compound that contains a six-membered aromatic ring bonded directly to a hydroxyl group (-OH).

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4-(1-propenyl)phenol

The word phenol is also used to refer to any compound that contains a six-membered aromatic ring, bonded directly to a hydroxyl group (-OH). In effect, phenols are a class of organic compounds of which the phenol discussed in this article is the simplest member.
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