The decreasing order of reactivity of $meta$-nitro-bromobenzene $(I)$,$2,4,6$-trinitro-bromobenzene $(II)$,$para$-nitro-bromobenzene $(III)$,and $2,4$-dinitro-bromobenzene $(IV)$ towards $HO^-$ ions is:

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.

Which of the following statements are correct?
$A$. The $C-Cl$ bond in chlorobenzene is shorter than in chloromethane.
$B$. It is more difficult to replace chlorine from chlorobenzene than from benzyl chloride.
$C$. The $C-Cl$ bond in chlorobenzene has some double bond character.
$D$. Chlorobenzene on chlorination gives $m$-dichlorobenzene.

The compound $A$ is formed by the reaction of benzotrichloride with $Br_2$ in the presence of $Fe$. Identify the compound $A$.

The product$(s)$ formed when toluene is reacted with $Cl_2$ in the presence of $Fe$ in the dark is/are:

The above reaction requires which of the following reaction conditions?