Which of the following compounds is classified as an alkaloid?

Step-by-step solution

Alkaloids are a class of naturally occurring organic nitrogen-containing bases. Cocaine is a tropane alkaloid obtained from coca leaves. Atropine is a tropane alkaloid extracted from deadly nightshade (Atropa belladonna). Nicotine is a pyridine-pyrrolidine alkaloid found in tobacco. Since all the given compounds are alkaloids, the correct choice is all of these. Answer: All of these