Q. To which of the following categories the drugs-caffeine, tannin and nicotine belongs?
Answer: Alkaloids
Notes: Alkaloids are present in plant tissues as water-soluble salts of organic acids (tartaric, scopolamine, cocaine, aconitine), or combined with tannins (Cinchona bark). Alkaloids with no oxygen atom in their structure (e.g., sparteine and nicotine). Their solubility in water is low (exceptions include caffeine and ephedrine).

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