Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

The compound is benzene-1,3,5-triol (phloroglucinol). The three O-H protons exchange instantly. In addition, phloroglucinol behaves like a tautomeric triketone : through its triketo tautomer (cyclohexane-1,3,5-trione) the three ring hydrogens (at C-2, C-4, C-6) are alpha to carbonyls and exchange with deuterium under OD⁻/D₂O. Total = 3 (O-H) + 3 (ring C-H) = 6.