Which of the following can not react with $NaHCO_3$?

Which one of the following phenols does not give colour when condensed with phthalic anhydride in the presence of conc. $H_2SO_4$?

The increasing order of $pK_{a}$ for the following phenols is:
$1$. $2, 4-$Dinitrophenol
$2$. $4-$Nitrophenol
$3$. $2, 4, 5-$Trimethylphenol
$4$. Phenol
$5$. $3-$Chlorophenol

In the Liebermann’s nitroso reaction,the changes in the colour of phenol occur as:

The major product of the following reaction sequence is:
$C_6H_5OH \xrightarrow[(ii) NaOH, (iii) H^+]{(i) CHCl_3, NaOH(aq)} ?$

What is the product of the sulfonation of phenol?