Why aryl fluorides and chlorides cannot ?

Why aryl fluorides and chlorides cannot ? intermediates for the introduction ot —r • -N02 groups into the aromatic ring. Aryl fluorides and iodides cappgVbe (he introducedby hTorine in chlorobenzene¯btiCéyåhoÄjenzene can be easily obtai -om diazonium salt. Thus, the replacement of diazo group by other groups is

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