Bromine (Br₂)is Often Used as a Quick Test for the Presence

Bromine (Br₂) is often used as a quick test for the presence of unsaturation in an aliphatic hydrocarbon.Bromine in CCl₄ is red.When bromine reacts with an alkene or an alkyne,the alkyl halide formed is colorless; hence the disappearance of the red color is a positive test for unsaturation.A student tested the contents of two vials,A and B,both containing compounds with the molecular formula C₆H₁₂.Vial A decolorized bromine,but vial B did not.How may the results for vial B be interpreted?

A) Vial B must contain a compound with only C−C single bonds.
B) Vial B must contain a compound with a triple bond.
C) Vial B must contain a compound with more than one C=C bond.
D) Vial B must contain a cyclic compound.
E) Vial B must contain a compound that is not a hydrocarbon.