An organic compound [A] which has characteristic odour, reacts with conc. to give two compounds [B]…

An organic compound [A] which has characteristic odour, reacts with conc. $\text{NaOH}$ to give two compounds [B] and [C]. Compound [B] has molecular formula $\text{C}_7\text{H}_8\text{O}$ which upon oxidation gives back compound [A]. Compound [C] is the sodium salt of the acid and upon treatment with sodalime yields an aromatic hydrocarbon [D]. Identify the compounds [A], [B], [C] and [D].