Acetylation of morphine
Glycosylation of morphine
Methylation of morphine
Nitration of morphine
Correct option is Acetylation of morphine. Treatment of morphine, at room temperature, with a mixture of trifluoroacetic anhydride (TFAA) and acetic acid (20–30 min) affords good yields of heroin. So, the correct answer is 'Acetylation of morphine'.