Chlorine water is added to separate solutions of sodium halides, each shaken with $\mathrm{CCl}{}_4$, the second addition being in large excess. Select all correct statements.

1. AChloride gives no colour change in the $\mathrm{CCl}{}_4$ layer because chlorine water cannot oxidise $\mathrm{Cl}{}^{-}$.
2. BBromide gives an orange-brown $\mathrm{CCl}{}_4$ layer because $\mathrm{Br}{}_2$ is formed.
3. CWith excess chlorine water, the violet iodide layer turns colourless as iodine is oxidised from 0 to +5.
4. DWith excess chlorine water, the iodide layer stays violet since iodine cannot be oxidised further.