A student extracted the active ingredient from several analgesic over-the-counte

Question

A student extracted the active ingredient from several analgesic over-the-counter drugs to
determine the composition of each one. Based on the label he tested all the drugs to see if
they contain acetaminophen (ACE), aspirin (ASP) and caffeine (CAF). However, he forgot to
label which spot corresponds to which drug. Shown below is the TLC plate the student
obtained from his experiment after extraction from Anacin®, Tylenol®, Vivarin® and
Excedrin® and using 2% acetic acid and 98% ethyl acetate as the mobile phase

Match the identity of the unknowns to the 4 listed OTC drugs (Anacin®, Tylenol®,
Vivarin® and Excedrin®

Explanation / Answer

unknown 4 contains    aspirin (ASP) and caffeine (CAF).

unknown 5 contains     acetaminophen (ACE),

unknown 6 contains      aspirin (ASP)

unknown 7 contains     acetaminophen (ACE), aspirin (ASP) and caffeine (CAF).

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