The reaction between chlorobenzene and chloral in the presence of concentrated sulphuric acid produces

Although chlorine is an electron-withdrawing group,it is ortho-para directing in electrophilic aromatic substitution reactions. Why?

The above reaction requires which of the following reaction conditions?

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

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

Which of the following $2$-halo nitrobenzene is most reactive towards nucleophilic aromatic substitution?