Write a test to detect the presence of a double bond in a molecule.

(N/A) The presence of a double bond in a molecule can be detected using the following tests:
$1$. Bromine Water Test: When an alkene is added to bromine water (which is brown in color),the bromine adds across the double bond,resulting in the decolourisation of the solution.
$C=C + Br_2 \rightarrow -C(Br)-C(Br)-$
$2$. Baeyer's Test: When an alkene is treated with cold,dilute,alkaline potassium permanganate $(KMnO_4)$ solution (which is purple in color),it gets decolourised,forming a vicinal diol.
$C=C + KMnO_{4(aq)} \rightarrow -C(OH)-C(OH)-$