The compound shown is heated with excess $\mathrm{LiAlH}{}_4$ in ether and then treated with water. What is the organic product?

The compound is butanenitrile. $\mathrm{LiAlH}{}_4$ adds two hydride equivalents across $\mathrm{C}\equiv \mathrm{N}$ and gives the primary amine butan-1-amine after work-up. The aldehyde would result from DIBAL-H, not from $\mathrm{LiAlH}{}_4$, and the carbon-nitrogen bond is retained.