MHT CET202519 Apr 2025Morning ShiftChemistryAlcohols Phenols and EthersActual

Select the correct IUPAC name of pyrogallol.

Options

ABenzene-1,3-diol
BBenzene-1,4-diol
CBenzene-1,3,5-triol
DBenzene-1,2,3-triol

Correct answer

D. Benzene-1,2,3-triol

Step-by-step solution

Pyrogallol denotes 1,2,3-trihydroxybenzene. Using IUPAC rules, the parent compound is benzene with three hydroxyl substituents. Numbering to minimize the sum of locants positions the hydroxyl groups at carbons 1, 2, and 3, giving benzene-1,2,3-triol. Comparing the options: A) Benzene-1,3-diol is resorcinol. B) Benzene-1,4-diol is hydroquinone. C) Benzene-1,3,5-triol is phloroglucinol. D) Benzene-1,2,3-triol is pyrogallol. The correct choice is D .

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