${\mathrm{C}}_6{\mathrm{H}}_5\stackrel{+}{{\mathrm{N}}_2}\mathrm{C}{\mathrm{l}}^{-}\underset{\left(\text{or}\right){\mathrm{Cu}}_2{\left(\mathrm{CN}\right)}_2}{\overset{\mathrm{Cu}/\mathrm{KCN}}{\to }}\mathrm{X}\underset{{\mathrm{H}}^{+}\left(\text{or}\right){\mathrm{OH}}^{-}}{\overset{{\mathrm{H}}_2\mathrm{O}}{\to }}\mathrm{Y}\underset{\mathrm{CaO}}{\overset{\mathrm{NaOH}}{\to }}\mathrm{Z}$. Wrong statement is 

Benzene carbonitrile (IUPAC) Benzonitrile (or)  phenyl cyanide

$$\begin{gathered} \stackrel{\mathrm{X}\to \mathrm{Y}}{\to }\text{Path } \\ -\mathrm{CN}\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }-{\mathrm{CONH}}_2\to -\mathrm{COOH}+{\mathrm{NH}}_3 \end{gathered}$$

 is itself a nucleophile. It will not undergo nucleophilic substitution but undergoes electrophilic substitution