In Friedel-Crafts acylation,besides $AlCl_3$,the other reactants are

Compound $I$ is heated with Conc. $HI$ to give a hydroxy compound $A$ which is further heated with $Zn$ dust to give compound $B$. Identify $A$ and $B$.

The intermediate $X$,in the reaction shown below,is ..... .

What will be the product,when salicylic acid,obtained by the Reimer-Tiemann process,is reduced with $Zn$ dust?

Arrange water,ethanol and phenol in increasing order of acidity and give reason for your answer.

What is $Z$ in the following sequence of reactions?
$p-chloronitrobenzene$ $\xrightarrow{NaOH, 443 \ K} X$ $\xrightarrow{(i) Sn + HCl (ii) NaNO_2 / HCl, 0-5^{\circ}C} Y$ $\xrightarrow{H_3O^{+}, 10^{\circ}C} Z$