Question
Answer the following question:
An organic compound A having molecular formula $\mathrm{C}_6 \mathrm{H}_6 \mathrm{O}$ gives a characteristic colour with aqueous $\mathrm{FeCl}_3$ solution. A on treatment with $\mathrm{CO}_2$ and NaOH at 400 K under pressure gives B which on acidification gives a compound C . The compound $C$ reacts with acetyl chloride to give $D$ which is a popular pain killer. Deduce the structure of $A, B, C$ and $D$.

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