Identify the product obtained when phenol is heated with $Zn$ dust.

Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution?

$A$ compound $A$ $(C_{7}H_{8}O)$ is insoluble in $NaHCO_{3}$ solution but dissolves 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:

In the reaction of phenol with $NaOH(aq)/Br_2$,the intermediate$(s)$ is(are):

Heating phthalic anhydride and concentrated sulfuric acid with which of the following yields phenolphthalein?

Benzoic acid on heating with $X$ gives benzene and phenol on heating with $Y$ gives benzene. What are $X$ and $Y$ respectively?