The order of reactivity of phenol $(I)$,nitrobenzene $(II)$,and benzene $(III)$ towards nitration is:

Which of the following reacts with diazonium salts to form dyes?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: Aryl halides cannot be prepared by the replacement of the hydroxyl group of phenol by a halogen atom.
Reason $R$: Phenols react with halogen acids violently.
In the light of the above statements,choose the most appropriate from the options given below:

What is the natural source of salicylic acid?

Given below are two statements :
Statement $I$ : Picric acid is $2,4,6$-trinitrotoluene.
Statement $II$ : Phenol-$2,4$-disulphonic acid is treated with conc. $HNO_3$ to get picric acid.
In the light of the above statements,choose the most appropriate answer from the options given below :

Write the chemical equations for the following reactions:
$(i)$ Reimer-Tiemann reaction
$(ii)$ Kolbe's reaction