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An organic compound (A) has 76.6% C and ...

An organic compound (A) has 76.6% C and 6.38% H. Its vapour density is 47. It gives characteristic colour with `FeCl_(3)` solution. (A) when treated with `CO_(2)` and NaOH at `140^(@)C` under pressure gives (B) which on acidification gives (C ). (C ) reacts with acetyl chloride to give (D) which is a well known pain killer. Identify (A), (B), (C ), (D) and explain the reactions involved.

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