Account for the statements :
p-Nitrochlorobenzene and o,p-dinitrochlorobenzene undergo Nucleophilic substitution readily compared to chlorobenzene .

Explanation

p-nitrochlorobenzene and o,p-dinitro chlorobenzene undergo nucleophilic substitution reachily compared to chlorobenzene due to the following reasons .
`to` Due to presence of `-NO_(2)` group which is an electron with drawing group at O and P -position in the ring makes the bond breaking easy .
`to` As the number of `NO_(2)` groups increases reactivity of aryl halides also increases . This can be evidended by the following reactions .