Salicylaldehyde is synthesized from phenol when reacted with:

The major product in the following reaction is:

Predict the product of the following reaction:
$HO-C_6H_5 + C_6H_5N_2^+Cl^- \xrightarrow{\text{base}} ?$

In Kolbe's reaction,instead of phenol,the phenoxide ion is treated with carbon dioxide. Why?

The electrophile involved in the reaction shown below is:
$C_6H_5OH + CHCl_3 + NaOH \rightarrow C_6H_4(ONa)CHO$

Compound $I$ is heated with Conc. $HI$ to give a hydroxy compound $A$ which is further heated with $Zn$ dust to give compound $B$. Identify $A$ and $B$.