Which of the given reaction cannot be used to prepare aromatic nitriles (ArCN)?

Question

Which of the given reaction cannot be used to prepare aromatic nitriles

(A r C N)

A r C O N H_{2} + S O C l_{2}

A r N_{2}^{+} + C u C N

A r C O N H_{2} + P_{2} O_{5}

A r X + K C N

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