Propane and propene cannot be distinguished by using

Propyne is a terminal alkyne, whereas alkene does not produce a white precipitate with an ammoniacal silver nitrate solution.

$\text{ Thus propene and propyne can be distinguished by }$

 ${\mathrm{Br}}_2$, ${\mathrm{KMnO}}_4$, ${\mathrm{O}}_3$.