Question

xperim fr G Orgeic nd c y eetandndeg 5. Below are structures of common aspinin substitutes Why do ibuprofen and naproxen not give a 376 positive test with 1% ironllD chloride? Why does acetaminophen give a positive test? CH3 н, CH-COOH CH, -сH-Сн, CH, CH CH,O CH-COOH OH Cн, Naproxen Acetaminophen Вргобео 6. Bottles containing old aspirin tablets often smell this smell? How does this chemical form? vinegar. The presence of what chemical causes 7. You may have observed that not all of the commercial aspirin dissolved in the added water. What would account for the undissolved material?

Answer 1

5) 1% FeCl₃ test is used for identification of phenols.

To give positive result with 1% FeCl₃, compound should have -OH group on benzene ring.

Phenols form a complex with Feric ions.

6 PhOH + FeCl₃ ------------> H₃ [ Fe(OPh)₆] + 3HCl

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Among the 3 given compounds, only Acetaminophen has -OH group on benzene ring.

Therefore, Acetaminophen shows positive test with 1% FeCl_3.