A student added some bromine (reddish orange) in some carbon tertra chloride ro a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it was observed that the reddish orange colour gradually faded and white fumes produced.

Question

A student added some bromine (reddish orange) in some carbon tertra chloride ro a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it was observed that the reddish orange colour gradually faded and white fumes produced.
with the aid of an equation explain clearly the the observations of the student.

DrBob222 · Answer

C4H10 + Br2 + no light ==> No reaction. C4H10 + Br2 + light ==> C4H9Br + HBr light catalyzes the reaction. The color of the Br2/CCl4 solution faded because the Br2 was used.