Which of the following compounds has the lowest boiling point?

Explain the classification of phenols with examples.

The major product of the following reaction sequence is:
Aniline $\xrightarrow[(i) NaNO_2, HCl, 273-278K]{(ii) H_2O, warm} \text{Product}$ $\xrightarrow[(iv) NaOH]{(iii) Br_2, (excess)} \text{Product}$ $\xrightarrow{(v) CH_3I} \text{Final Product}$

Consider the given chemical reaction sequence:
(Image provided)
Total sum of oxygen atoms in Product $A$ and Product $B$ are .........

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

The correct order of acidic strength of the following compounds:
$A.$ Phenol
$B.$ Cresol
$C.$ $m-$Nitrophenol
$D.$ $p-$Nitrophenol