$A$ major component of Borsch reagent is obtained by reacting hydrazine hydrate with which of the following?

The increasing order of the rate of nucleophilic substitution reaction for the following compounds is:

Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution:
$(I)$ $p$-nitrochlorobenzene
$(II)$ $2,4$-dinitrochlorobenzene
$(III)$ $2,4,6$-trinitrochlorobenzene

Identify the position where the nucleophilic attack of $(ArO^{-})$ is most favourable in the given molecule.

How will you convert $4-$nitrotoluene to $2-$bromobenzoic acid?

Identify the principal organic product of the following reaction:
$1-bromo-2-fluoro-4-nitrobenzene + NaSCH_3 \rightarrow \text{product}$