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Question: Aromatic nitriles (ArCN) are not prepared by reaction...

Aromatic nitriles (ArCN) are not prepared by reaction

A

ArX + KCN

B

ArN2++CuCNArN_{2}^{+} + CuCN

C

ArCONH2+P2O5ArCONH_{2} + P_{2}O_{5}

D

ArCONH2+SOCl2ArCONH_{2} + SOCl_{2}

Answer

ArX + KCN

Explanation

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 CN−CN^{-} & show the inertness against KCNKCN while other option gives Aromatic nitrile

ArN2++CuCN→ArCN+N2+Cu+\mathbf{Ar}\mathbf{N}_{\mathbf{2}}^{\mathbf{+}}\mathbf{+ CuCN}\mathbf{\rightarrow}\mathbf{ArCN +}\mathbf{N}_{\mathbf{2}}\mathbf{+ C}\mathbf{u}^{\mathbf{+}}

ArCONH2→P2O5−H2OArCN\mathbf{ArCON}\mathbf{H}_{\mathbf{2}}\underset{\mathbf{-}\mathbf{H}_{\mathbf{2}}\mathbf{O}}{\overset{\mathbf{\quad}\mathbf{P}_{\mathbf{2}}\mathbf{O}_{\mathbf{5}}\mathbf{\quad}}{\rightarrow}}\mathbf{ArCN}

ArCONH2+SOCl2→ArCN+SO2+2HCl\mathbf{ArCON}\mathbf{H}_{\mathbf{2}}\mathbf{+ SOC}\mathbf{l}_{\mathbf{2}}\mathbf{\rightarrow}\mathbf{ArCN + S}\mathbf{O}_{\mathbf{2}}\mathbf{+ 2HCl}