True about hydrolysable tannins: I. Hydrolyzes to pyrogallol II. Decolorizes potassium permanganate III. Produces a leather type called bloom IV. Does not give a positive result with bromine water

• A. I, II
• B. I, III
• C. I, II, III
• D. I, II, IV

Answer: (C)

Hydrolysable tannins are esters that, when broken down by hydrolysis, release simple phenolic units such as gallic or ellagic acids (and, under some conditions, related products like pyrogallol). This makes the first statement plausible because hydrolysis can yield pyrogallol-type phenolics.

They are also strong reducing agents, so they decolorize potassium permanganate. That oxidation-reduction behavior is a hallmark of tannins in standard qualitative tests, which supports the second statement.

In leather tanning, tannins can produce a visible bloom—a whitish coating or powdery layer on the leather surface—due to the deposition of tannin compounds on the hide, aligning with the third statement.

Regarding bromine water, hydrolysable tannins do give a positive result because the phenolic structure readily reacts with bromine, causing decolorization. Therefore, the statement claiming no positive result with bromine water is not correct.

So the true statements are the hydrolysis product formation, the KMnO4 decolorization, and the bloom on leather; the bromine test result is positive, not negative.