Two hydrocarbons X and Y were treated with bromine water. X decolorised the solution and Y did not not. Which class of compound does Y belong?
A
Benzene
B
Alkynes
C
Alkenes
D
Alkanes
Verified Correct Answer: D.
Chemical Principles & Mechanism
Bromine water is an orange solution of bromine. It becomes colorless when it is shaken with an alkene. Alkenes can decolorize bromine water, but alkanes cannot.
X is ethene which decolorizes bromine water showing that ethene is unsaturated.
Y is an alkane.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4687)