What is the major chemical constituent of 'Oil of Wintergreen', used as a topical analgesic ointment?
Answer and explanation
Correct answer: B. Methyl salicylate
- Step 1: Salicylic acid reacts with methanol in the presence of acid catalyst (esterification). Step 2. The carboxylic acid group is esterified to yield methyl salicylate, a sweet-smelling liquid known as oil of wintergreen. Answer: Methyl salicylate. Why not the others: Acetylsalicylic acid is aspirin; Ethyl salicylate is a different ester; Sodium benzoate is a food preservative.
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