KVV E-Modules

Which of the following best describes tannins?

A: Low molecular weight lipophilic compounds B: Water-insoluble polyphenolic acids C: High molecular weight water-soluble polyphenolic compounds D: Volatile aromatic hydrocarbons

Which of the following is NOT a property of tannins?

A: Ability to precipitate proteins B: Astringent taste C: High volatility D: Water solubility

Which tannins are also referred to as non-hydrolysable tannins?

A: Hydrolyzable tannins B: Complex tannins C: Condensed tannins D: Pseudo-tannins

Which tannins are also referred to as non-hydrolysable tannins?

A: Complex tannins B: Condensed tannins C: Pseudotannins D: Gallotannins

Gallotannins on hydrolysis yield:

A: Ellagic acid B: Gallic acid C: Catechol D: Pyrogallol

Which of the following is a distinguishing feature of pseudo-tannins?

A: They precipitate proteins B: They give Gold beater’s skin test C: They contain sugar moieties D: They cannot precipitate proteins

Which of the following is an example of a condensed tannin?

A: Gallotannin B: Castalagin C: Catechin D: Ellagitanin

Complex tannins are formed by the combination of:

A: Ellagic acid and catechin B: Galloyl group and flavonoid unit C: Gallic acid and protein D: Flavonoids and alkaloids

On dry distillation, condensed tannins yield:

A: Catechol B: Gallic acid C: Pyrogallol D: Tartaric acid

Which class of tannins is reported primarily in the Araliaceae family?

A: Phlorotannins B: Phlobatannins C: Condensed tannins D: Pseudotannins

Which of the following solvents is commonly used to extract tannins?

A: Methanol B: Benzene C: Hexane D: Chloroform