The equation represents the reaction of a halogen with aqueous bromide ions. $X_2 + 2\text{Br}^- \rightarrow 2X^- + \text{Br}_2$ Which words should be used to fill gaps 1, 2 and 3?
- Achlorine; brown; colourless
- Bchlorine; colourless; brown
- Ciodine; brown; colourless
- Diodine; colourless; brown