Question

The color of bromine solution is:
(a) Red
(b) Purple
(C) Orange
(d) Green
(e) Blue

Answer 1

Hint: The color of the solution is the same as that of potassium dichromate. However, elemental bromine is fuming reddish-brown liquid at room temperature. It is used for the unsaturation test.

Complete step by step answer:
> Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature (melts at $-{7.2}^{\text{o}}\text{C}$ boils at ${58.8}^{\text{o}}\text{C}$) that evaporates readily to form a similarly colored gas whereas bromine water is orange solution of bromine. It becomes colorless when it is shaken with an alkene. Alkenes can decolorize bromine water, but alkanes cannot.
> Physical properties of Bromine:
- It is deep red colored, volatile liquid
- Bromine is poisonous and produces blisters on skin
- It has a pungent odor.
- It is soluble in water. Its aqueous solution is called bromine water.
Thus, the correct option is (c) Orange.

Note: It should be noted that it is very important test for unsaturation-
- If the color change is instantaneous and there is no precipitate, it is an additional reaction.
- The bromine test is a qualitative test for the presence of alkenes, alkynes and phenols.
- Alkanes give no visible reaction under these conditions. The reddish-brown color does not disappear.
- If a white precipitate forms along with the discoloration, then phenol is present.