As far as I know it's not possible for 1,3,5-trihydroxybenzene to give the haloform reaction.
The prerequisites(that I know) for the haloform reaction are:
Only those organic compounds which can be converted to a methyl ketone or acetaldehyde by means of oxidation (by $\ce{NaOX}$ ($\ce{NaOH + X2}$) type agents which are present in the reaction mixture) give this reaction. And obviously a methyl ketone or acetaldehyde would give this reaction too.
So the problem is I don't see how 1,3,5-trihydroxybenzene meet those prerequisites. Is there any way out because in a recent practice test I came to know that 1,3,5-trihydroxybenzene does give the haloform reaction.
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