Which of the following compounds is an alkaloid ?
Morphine
Alkaloids are naturally occurring, basic, nitrogen-containing compounds of plant origin, usually with the nitrogen in a heterocyclic ring, and often with marked physiological activity.
Morphine, isolated from the opium poppy (Papaver somniferum), contains a tertiary N-methyl amine in a piperidine ring of its pentacyclic skeleton; it is basic and a powerful analgesic, so it is a classic alkaloid.
Tocopherol (vitamin E) is a chromanol with a long isoprenoid side chain, and carvone (spearmint and caraway oils) and camphor are monoterpene ketones. None of these contains nitrogen, so none is an alkaloid.
Therefore morphine is the alkaloid.
Hence, Morphine.
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