A sodium halide is heated with $\mathrm{MnO}{}_2$ and concentrated $\mathrm{H}{}_2\mathrm{SO}{}_4$. Reddish-brown vapours are evolved, which colour carbon tetrachloride orange-brown. The halide is one of chloride, bromide or iodide. Identify it and the species of manganese in the solution afterwards.

1. Aiodide; $\mathrm{Mn}{}^{2+}$
2. Bbromide; $\mathrm{Mn}{}^{3+}$
3. Cchloride; $\mathrm{Mn}{}^{2+}$
4. Dbromide; $\mathrm{Mn}{}^{2+}$