Step 1: Understanding the Concept:
Pyrogallol is a common name for a specific trihydroxybenzene isomer. IUPAC nomenclature uses the benzene ring as the parent name and numbers the substituent positions to give them the lowest possible locants.
Step 2: Key Formula or Approach:
Identify hydroxy substitution pattern:
Catechol = 1,2-diol
Resorcinol = 1,3-diol
Quinol = 1,4-diol
Pyrogallol = 1,2,3-triol
Step 3: Detailed Explanation:
Pyrogallol consists of a benzene ring with three hydroxyl groups attached to adjacent carbons. This arrangement is numbered 1, 2, and 3. Therefore, its IUPAC name is Benzene-1,2,3-triol.
Step 4: Final Answer:
The name is Benzene-1,2,3-triol.