Question

Aromatic nitriles $\left(ArCN\right)$ are not prepared by reaction:

• A. $ArX+KCN$
• B. $Ar{N}_2^{+}+CuCN$
• C. $ArCON{H}_2+P_2{O}_5$
• D. $ArCON{H}_2+SOC{l}_2$

Answer 1

The correct option is A $ArX+KCN$

Option A is correct.

For Option A:

Halogen has +I and +M effect by which its electron delocalized in benzene ring by resonance & due to its +I effect its bonded with a benzene ring and cannot be substituted by $C{N}^{-}$ & show the inertness against $KCN$.

Since Aryl halides, $\left(ArX\right)$ does not undergo nucleophilic substitution because they have a strong $C-X$ bond due to resonance.

Since Aromatic nitriles $\left(ArCN\right)$ are not prepared by this reaction.

Thus, option A is correct.