Answer :
Final answer:
Salicylic acid contains the hydroxyl group not present in aspirin. Aspirin contains the acetyl group absent in salicylic acid.
Explanation:
The functional group found in salicylic acid but not in aspirin is the hydroxyl (-OH) group.
The functional group found in aspirin but not in salicylic acid is the acetyl group (CH3CO-).
For example, salicylic acid's structure C6H4OH(CO2H) contains the -OH functional group, while aspirin's structure CH3CO2C6H4CO2H includes the acetyl group, changing its properties.
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