Phenol in the presence of sodium hydroxide reacts with chloroform to form salicylaldehyde. This reaction is known as:

The order of acidic strength of $X, Y$ and $Z$ is:
Phenol reacts with dilute $HNO_3$ to form $X$ ($o$-nitrophenol) and $Y$ ($p$-nitrophenol). Phenol reacts with concentrated $HNO_3$ and $H_2SO_4$ to form $Z$ ($2,4,6$-trinitrophenol or picric acid).

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 $\xrightarrow{O_2} C$ $\xrightarrow{D} \text{Phenol} + \text{acetone}$

The sequence of reactions is: $Phenol$ $\xrightarrow[\Delta]{Zn \, dust} X$ $\xrightarrow[\text{Anhydrous } AlCl_3]{CH_3Cl} Y$ $\xrightarrow[\Delta]{KMnO_4} Z$. The final product $Z$ is:

In the following reaction,the main product will be:

Which of the following statements is not correct?