I₂ is violet in the solid as well as in gas phase. however, in acetone or ethanol, it turns brown. choose the correct statement(s) for this colour change:
1) The change in color of i₂ from violet to brown in acetone or ethanol is due to a chemical reaction.
2) The change in color of i₂ from violet to brown in acetone or ethanol is due to a physical change.
3) The change in color of i₂ from violet to brown in acetone or ethanol is due to the presence of impurities.
4) The change in color of i₂ from violet to brown in acetone or ethanol is due to the change in temperature.