Which is more reactive towards nucleophilic substitution: 2-nitrochlorobenzene or 2,4,6-trinitrochlorobenzene?

Which is least reactive towards nucleophilic substitution (S_(N^(2)))

Which is least reactive towards nucleophilic substitution (S_(N^(2)))

Which is least reactive towards nucleophilic substitution (S_(N^(2)))

Which of most reactive towards nucleophilic aromatic substitution.

Arrange the following in the increasing order of ease of nucleophilic substitution reaction Chlorobenzene (I) 2,4,6 trinitrochlorobenzene (II) 2,4 dinitro- chlorobenzene (III) and 4- nitrochlorobenzene (IV)

Arrange the following in the increasing order of ease of nucleophilic substitution reaction Chlorobenzene (I) 2,4,6 trinitrochlorobenzene (II) 2,4 dinitro- chlorobenzene (III) and 4- nitrochlorobenzene (IV)