Which among the following drug is obtained by acetylation of morphine?

Heroin

The correct answer is Option (3) - Heroin

Heroin, commonly known as smack, is chemically diacetylmorphine. It is a white, odorless, bitter crystalline compound. This is obtained by acetylation of morphine. Heroin is derived from morphine, which is extracted from the latex of the opium poppy plant (Papaver somniferum).

The acetylation of morphine involves adding acetyl groups to the morphine molecule, resulting in the formation of diacetylmorphine, which is the chemical name for heroin. This chemical modification increases the potency and enhances the effects of the drug, leading to its highly addictive nature.