Which of the following reactions cannot be us | vedclass

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(A) In aryl halides $(ArX)$,the halogen atom is attached to the benzene ring through a $C-X$ bond that has partial double bond character due to resona

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$ArX + KCN$

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(A) In aryl halides $(ArX)$,the halogen atom is attached to the benzene ring through a $C-X$ bond that has partial double bond character due to resonance. This makes the $C-X$ bond shorter and stronger,making nucleophilic substitution by $CN^-$ ions extremely difficult under normal conditions. Therefore,the reaction $ArX + KCN$ does not proceed to form $ArCN$. Other reactions provided are standard methods: $ArN_2^+Cl^- + CuCN 	o ArCN + N_2 + CuCl$ (Sandmeyer reaction). $ArCONH_2 + P_2O_5 	o ArCN + H_2O$ (Dehydration). $ArCONH_2 + SOCl_2 	o ArCN + SO_2 + 2HCl$ (Dehydration).

Which of the following reactions cannot be used to prepare an aromatic nitrile $(ArCN)$?

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