Which of the following compounds undergoes nucleophilic substitution reaction most easily?

Two statements are given below:
Statement $I$: Chlorobenzene on nitration gives $1-$chloro$-4-$nitrobenzene as the major product.
Statement $II$: Chlorobenzene undergoes nitration more slowly than benzene.
Identify the correct answer.

Arrange the following compounds in the decreasing order of their reactivity towards $OH^-$: $m$-nitrobromobenzene $(I)$,$2,4,6$-trinitrobromobenzene $(II)$,$p$-nitrobromobenzene $(III)$,and $2,4$-dinitrobromobenzene $(IV)$.

Give reactions of aryl halides with metals.

$1$-$Chloro$-$4$-$nitrobenzene$,$1$-$Chloro$-$2,4$-$dinitrobenzene$ and $1$-$Chloro$-$2,4,6$-$trinitrobenzene$ are transformed to corresponding phenols with the reagents $X$,$Y$,$Z$ respectively. What are $X$,$Y$,$Z$?

In a set of reactions,$p$-nitrotoluene yielded a product $E$. The product $E$ would be:
$p$-nitrotoluene $\xrightarrow[FeBr_3]{Br_2} B$ $\xrightarrow{Sn/HCl} C$ $\xrightarrow[HCl]{NaNO_2} D$ $\xrightarrow[HBr]{CuBr} E$