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Answer the following question:$An$ organic compound A having molecular formula $\ce{C_6H_6O}$ gives a characteristic colour with aqueous $\ce{FeCl_3}$ solution. A on treatment with $\ce{CO_2}$ and $\ce{NaOH}$ at $400K$ 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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