Propane nitrile react with $\mathrm { SnCl } _ { 2 } + \mathrm { HCL }$, followed by hydrolysis form X But-2-ene react with $\mathbf { O } _ { \mathbf { 3 } } , \mathrm { Zn }$ form Y X \& Y react with $\mathbf { O H } \boldsymbol { / }$ heat form different products which product can not form.