Which of the following organic compounds would decolourize bromine water?A BenzeneB CyclobutaneC HexaneD Pentane

Bromine water is used as a test for unsaturated hydrocarbons, i.e., alkenes and alkynes. These compounds contain carbon-carbon double or triple bonds. The bromine adds across the double or triple bond, causing the reddish-brown color of the bromine water to disappear.

Looking at the options:

A. Benzene - Although benzene has a ring structure, it is not an unsaturated hydrocarbon because it does not contain carbon-carbon double or triple bonds in the same sense as alkenes or alkynes. The electrons in the ring are delocalized over the whole molecule, so it does not react with bromine water in the same way.

B. Cyclobutane - This is a saturated hydrocarbon with a ring structure. It does not contain any carbon-carbon double or triple bonds.

C. Hexane - This is a saturated hydrocarbon. It does not contain any carbon-carbon double or triple bonds.

D. Pentane - This is a saturated hydrocarbon. It does not contain any carbon-carbon double or triple bonds.

Therefore, none of the compounds listed would decolorize bromine water.