Concept:Dihydroxy derivatives of benzene have specific common names based on the relative positions of the two hydroxyl groups.
Explanation:In
Benzene-1,2-diol, the two
−OH groups are attached to adjacent carbon atoms of the benzene ring.
This arrangement is known as the ortho-isomer.
The common name assigned to this ortho-dihydroxybenzene is catechol.
For comparison, Benzene-1,3-diol is called resorcinol, and Benzene-1,4-diol is called quinol.
Pyrogallol is a trihydroxybenzene, so it does not match the given structure.
Answer:Option A. Catechol