The major product in the following reaction is:

The increasing order of $pKa$ values of the following compounds is:

Which of the following reagents can be used to distinguish between phenol and ethanoic acid?

The rate of electrophilic substitution reaction in phenol is:

The reaction sequence is as follows: $C_6H_5SO_3H$ $\xrightarrow[(ii) H^+]{(i) NaOH} P$ $\xrightarrow{Na_2Cr_2O_7, H_2SO_4} Q$. The ratio of $\sigma$ bonds to $\pi$ bonds in $Q$ is:

In the Reimer-Tiemann formylation reaction,by how much does the molecular weight of phenol increase?