1,3,5-trihydroxybenzene give positive
iodoform test because it is in equilibrium with its tautomer
cyclohexane-1,3,5-trione. It give 3,5-dioxohexanoic acid (CH3-CO-CH2-CO-CH2-COOH)
on reaction with strong base (OH-) (I2+NaOH Iodoform reagent)
,which has a CH3-CO (acetyl) group, so it’ clear that it would be
give positive iodoform test.
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