Common name of Benzene-1, 2-diol is

The correct option is catechol.

To understand the nomenclature of dihydroxybenzene derivatives, let us look at the relationship between their IUPAC names and common names:
1. Benzene-1,2-diol: This compound contains two hydroxyl (-OH) groups on adjacent carbon atoms of the benzene ring (ortho-position). The common name for this compound is catechol.
2. Benzene-1,3-diol: This compound has hydroxyl groups at the 1 and 3 positions (meta-position). Its common name is resorcinol.
3. Benzene-1,4-diol: This compound has hydroxyl groups at the 1 and 4 positions (para-position). Its common name is quinol (or hydroquinone).

Additionally, o-cresol is the common name for 2-methylphenol, which has a methyl group (-CH₃) and a hydroxyl group (-OH) on adjacent carbons, rather than two hydroxyl groups.

Thus, the common name of Benzene-1,2-diol is catechol.