What will be the product of the reaction with $HBr$?

The correct order of boiling point for the given compounds is:

Write the structures of the major products expected from the following reactions:
$(a)$ Mononitration of $3-$methylphenol
$(b)$ Dinitration of $3-$methylphenol
$(c)$ Mononitration of phenyl methanoate.

Identify the product in the following reaction:
Phenol + $CHCl_3 + NaOH \rightarrow \text{Product}$

Which of the following groups increases the acidity of phenol?

$A$ trisubstituted compound '$A$',$C_{10}H_{12}O_2$ gives a neutral $FeCl_3$ test positive. Treatment of compound '$A$' with $NaOH$ and $CH_3Br$ gives $C_{11}H_{14}O_2$,with hydroiodic acid $(HI)$ gives methyl iodide,and with hot conc. $NaOH$ gives a compound $B$,$C_{10}H_{12}O_2$. Compound '$A$' also decolorises alkaline $KMnO_4$. The number of $\pi$ bonds present in the compound '$A$' is $...........$