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

question 62

Multiple Choice

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.

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