The correct answer is Option (4) → Benzene-1,3-diol
- Resorcinol is a benzene ring with two hydroxyl (–OH) groups at the 1 and 3 positions (meta to each other).
- According to IUPAC nomenclature, the parent chain is benzene, and the compound is named as a diol with locants indicating the positions of the –OH groups.
- The lowest possible locants are used: 1,3.
Thus, the IUPAC name is benzene-1,3-diol.
Why the others are wrong:
- Benzene-1,2-diol → This is catechol (ortho-dihydroxybenzene)
- 2-methylphenol → This is o-cresol
- 3-methylphenol → This is m-cresol
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