An organic compound with molecular formula $\mathrm{C}_7 \mathrm{H}_8 \mathrm{O}$ dissolves in $\mathrm{NaOH}$ and gives a characteristic colour with $\mathrm{FeCl}_3$. On treatment with bromine, it gives a tribromo derivative $\mathrm{C}_7 \mathrm{H}_5 \mathrm{OBr}_3$. The compound is