You have successfully isolated a compound you know to be one of three narcotic analgesics. How could you use IR to determine which compound you have isolated? What specific bands would you be looking to be present or absent?
The key to this problems is simply recognizing the fuctional groups. While the structures may be pretty similar overall there are key differences. For example heroine should display a carbonyl peak, while this would be true of oxycodone as well, in oxycodone you would also have an OH peak. Morphine should have no peaks in the carbonyl region.
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