Test for alkanes vs Test for alkanes

Question 1

Test for Alkanes

Answer 1

Alkane + Br₂(aq) →Halogenoalkane in the presence of UV light.
Brown to colourless.
Colour change only happens in presence of sunlight/UV light.

Question 2

Test for Alkenes

Answer 2

Alkene + Br₂(aq) →Halogenoalkane in the absence (and presence) of UV light.
Brown to colourless.
Colour change can happen in absence (and the presence) of sunlight/UV light.