Aromatic nitriles `(ArCN)` are not prepared by reaction .

Options

A. `ArX+KCN`
B. `ArN_2^(+)+CuCN`
C. `ArCONH_2+P_2O_5`
D. `ArCONH_2+SOCl_2`

Answer

A

Explanation

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 substitue by `CN^(-)` & show the inertness against KCN while other option gives aromatic nitrile
`ArN_2^(+)+CuCNrarrArCN+N_2+Cu^(+)`
`ArCONH_2underset(-H_2O)overset(P_2O_5)toArCN`
`ArCONH_2+SOCl_2rarrArCN+SO_2+2HCl`