In Serpeck's process bauxite is heated with coke in a stream of nitrogen to give $\mathrm{AlN}$. Treating $\mathrm{AlN}$ with water gives

1. A$\mathrm{Al}(\mathrm{OH}){}_3$ and $\mathrm{N}{}_2$
2. B$\mathrm{Al}$ and $\mathrm{NH}{}_3$
3. C$\mathrm{Al}(\mathrm{OH}){}_3$ and $\mathrm{NH}{}_3$
4. D$\mathrm{Al}{}_2\mathrm{O}{}_3$ and $\mathrm{N}{}_2$