Question

Choose the correct statement from the following:
(A) Tannin solution precipitate alkaloid
(B) Hydrolysable tannin produce gallic and ellagic acid by enzymatic and acid hydrolysis
(C) Condensed tannin converted into red color substance known as phlobaphene on acid and enzymatic hydrolysis
(D) Tannin are insoluble in water

• A. $ \text{A and C Only} $
• B. $ \text{B Only D Only} $
• C. $ \text{C Only} $
• D. $ \text{A, B and C are correct} $

Hint:

Tannins are classified into hydrolysable and condensed types—both have characteristic reactions important in crude drug analysis.

Answer 1

The Correct Option is D

- [A]: True. Tannins precipitate alkaloids, gelatin, and heavy metals due to their astringent and protein-binding properties. - [B]: True. Hydrolysable tannins are broken down by enzymatic or acidic hydrolysis to yield gallic acid and ellagic acid.
- [C]: True. Condensed tannins (catechol-type) are polymerized to form phlobaphenes, which are red-brown insoluble substances.
- [D]: False. Tannins are highly water-soluble, and aqueous extracts are commonly used in phytochemical tests.