16 Questions
What color change is observed when Pyrogallol tannins are treated with FeCl3 T.S.?
Blue color
Which of the following is a property of Catechol tannins when boiled with HCl?
Forms an insoluble red Phlobaphenes
What type of tannin forms a precipitate when treated with Bromine T.S.?
Catechol tannins
Which of the following is a common source of Pyrogallol tannins?
Pomegranate bark
What is a notable use of tannins mentioned in the text?
Astringent
What is the characteristic color obtained when non-hydrolysable tannins are treated with acids/enzymes?
Red
Which of the following is a pseudotannin that is a derivative of Flavan?
Cocoa
What color precipitate is obtained when pseudotannins react with Bromides?
Red
Which polyphenol structure is associated with Catechins in the biosynthesis of molecules?
Flavan-3-ol
What do true tannins convert into when subjected to dry distillation?
Catechol
Which of the following is NOT an example of a pseudotannin?
Unroasted coffee
What can be said about the properties of tannins based on the text?
Tannin Extracts can precipitate proteins.
Which enzymes can hydrolyze Hydrolysable Tannins according to the text?
Tannase
What type of acid is formed when Hydrolysable Tannins are hydrolyzed according to the text?
Gallic acid
How are Non-Hydrolysable Tannins classified based on the text?
As polyphenols
What color change is observed when Hydrolysable Tannins react with Ferric chloride?
Blue
Test your knowledge about the polymeric Flavan-3-ol structures related to Flavonoid pigments and Catechins in the biosynthesis of molecules. Explore the classification of Non-Hydrolysable Tannins and their conversions with acids and enzymes.
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