A) ArX + KCN
B) \[ArN_{2}^{+}+CuCN\]
C) \[ArCON{{H}_{2}}+{{P}_{2}}{{O}_{5}}\]
D) \[ArCON{{H}_{2}}+SOC{{l}_{ 2}}\]
Correct Answer: A
Solution :
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 \[C{{N}^{-}}\] & show the inertness against \[KCN\] while other option gives Aromatic nitrile \[ArN_{2}^{+}+CuCN\to ArCN+{{N}_{2}}+C{{u}^{+}}\] \[ArCON{{H}_{2}}\underset{-{{H}_{2}}O}{\mathop{\xrightarrow{{{P}_{2}}{{O}_{5}}}}}\,ArCN\] \[ArCON{{H}_{2}}+SOC{{l}_{2}}\to ArCN+S{{O}_{2}}+2HCl\]
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