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Give reason : The presence of nitro group (-NO_(2))at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions. |
Answer» Solution :For a nucleophilic reaction to take place, a positive centre should be created where the nucleophile could attach itself. PRESENCE of a nitro GROUP at ortho or para position creates such a positive centre at the carbon where the HALOGEN is attached as shown:  Such a positive centre is not created at the halogen bearing carbon if the nitro group is PRESENT at m-position relative to halogen. INSTEAD it is produced at a position which is of no use. 
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