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Polymeric Flavan-3-ol Structures Quiz

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Questions and Answers

What color change is observed when Pyrogallol tannins are treated with FeCl3 T.S.?

Blue color (correct)

Red color

Yellow color

Green color

Which of the following is a property of Catechol tannins when boiled with HCl?

Forms a yellow precipitate

Remains unchanged

Turns black

Forms an insoluble red Phlobaphenes (correct)

What type of tannin forms a precipitate when treated with Bromine T.S.?

Pyrogallol tannins

Ellagic acid tannins

Gallic acid tannins

Catechol tannins (correct)

Which of the following is a common source of Pyrogallol tannins?

Pomegranate bark Signup and view all the answers

What is a notable use of tannins mentioned in the text?

Astringent Signup and view all the answers

What is the characteristic color obtained when non-hydrolysable tannins are treated with acids/enzymes?

Red Signup and view all the answers

Which of the following is a pseudotannin that is a derivative of Flavan?

Cocoa Signup and view all the answers

What color precipitate is obtained when pseudotannins react with Bromides?

Red Signup and view all the answers

Which polyphenol structure is associated with Catechins in the biosynthesis of molecules?

Flavan-3-ol Signup and view all the answers

What do true tannins convert into when subjected to dry distillation?

Catechol Signup and view all the answers

Which of the following is NOT an example of a pseudotannin?

Unroasted coffee Signup and view all the answers

What can be said about the properties of tannins based on the text?

Tannin Extracts can precipitate proteins. Signup and view all the answers

Which enzymes can hydrolyze Hydrolysable Tannins according to the text?

Tannase Signup and view all the answers

What type of acid is formed when Hydrolysable Tannins are hydrolyzed according to the text?

Gallic acid Signup and view all the answers

How are Non-Hydrolysable Tannins classified based on the text?

As polyphenols Signup and view all the answers

What color change is observed when Hydrolysable Tannins react with Ferric chloride?

Blue Signup and view all the answers