A mono-substituted aromatic compound P decolourizes bromine water, gives a purple red colour with aqueous FeCl$_3$ and is also soluble in aqueous NaOHCompound P undergoes acetylation with reagent Q in the presence of a base to give R as the major productReagent Q displays two characteristic bands at 1830 cm$^{-1}$ and 1750 cm$^{-1}$ in its IR spectrumP, Q and R are
