Which one of the following is not present in the nitration mixture?

Which of the following compounds does not give a tribromo derivative upon reaction with $Br_2/H_2O$?

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 represents a nucleophilic aromatic substitution reaction?

Which of the following groups is strongly ortho and para directing?

The $C-Cl$ bond lengths (in $pm$) in haloarene and haloalkane are respectively: