Identify the reactant $x$ in the following chemical reaction:
$Phenol + (x) \xrightarrow[(2) H^+]{(1) NaOH} Salicylaldehyde$

Which of the following substances does not contain a $-COOH$ group?

The major product in the following reaction is:

$C_6H_6 + X \xrightarrow{anhydrous AlCl_3} \text{Isopropylbenzene} \xrightarrow{(i) O_2, (ii) H^+} Y + Z$. In this reaction,$X, Y$ and $Z$ are . . . . . . respectively.

Reaction of phenol with $NaOH$ followed by heating with $CO_{2}$ under high pressure,and subsequent acidification gives compound $X$ as the major product,which can be purified by steam distillation. When reacted with acetic anhydride in the presence of a trace amount of conc. $H_{2}SO_{4}$,compound $X$ produces $Y$ as the major product. Compound $Y$ is $....$

Write the chemical reactions for the preparation of anisole and phenetole from phenol.