Concept:Dihydroxybenzenes are named by the relative positions of the two hydroxyl groups on the benzene ring.
Explanation:Benzene-1,3-diol has two
−OH groups on carbon atoms 1 and 3 of the benzene ring.
The common names of dihydroxybenzenes are:
Benzene-1,2-diol: Catechol.
Benzene-1,3-diol: Resorcinol.
Benzene-1,4-diol: Quinol (hydroquinone).
Pyrogallol is benzene-1,2,3-triol, not a diol.
Hence, the compound given in the question is named Resorcinol.
Answer:B. Resorcinol
