Q. A compound '$A$' $\left( C _{7} H _{8} O \right)$ is insoluble in $NaHCO _{3}$ solution but dissolve in $NaOH$ and gives a characteristic colour with neutral $FeCl _{3}$ solution. When treated with Bromine water compound '$A$' forms the compound $B$ with the formula $C _{7} H _{5} OBr _{3} .$ ' $A$ ' is
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