Aromatic nitriles (ArCN) are not prepared by reaction

Halogen have -I and +M effect by which its electron delocalized in benzene ring by resonance & due to its – I effect its bonded with benzene ring and cannot be substitute by CN– & show the inertness against KCN while other option gives Aromatic nitrileArN2++CuCN→ArCN+N2+Cu+ ArCONH2→-H2OP2O5ArCN ArCONH2+SOCl2→ArCN+SO2+2HCl