Phenolphthalein is obtained by heating phthalic anhydride with conc. $H_2SO_4$ and

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

Why is picric acid a stronger acid than carboxylic acids,despite being a phenolic compound?

What are $A, B, C$ and $D$ in the following reactions?
$i)$ Aniline $\xrightarrow[273 \ K]{NaNO_2 \mid HCl} A$ $\xrightarrow{B} \text{Phenol}$
$ii)$ Cumene $\xrightarrow{O_2} C$ $\xrightarrow{D} \text{Phenol} + \text{acetone}$

In the following reaction sequence,identify $Q$:
$p\text{-Chloronitrobenzene}$ $\xrightarrow[\Delta, P]{NaOH} P$ $\xrightarrow{C_6H_5CH_2Cl} Q$

Phenol,when it first reacts with concentrated sulphuric acid and then concentrated nitric acid,gives: