Also known as alkenes, they are particularly used in pharmaceutical research, but Bredt’s rule has limited what synthetic molecules scientists can make. It’s held back “their use in drug ...

Bromine water is an orange solution of bromine. It becomes colourless when it is shaken with an alkene. Alkenes can decolourise bromine water, but alkanes cannot. The slideshow shows this process.

The rapid disappearance of the amber color of the bromine at room temperature is characteristic of reaction with alkenes. (colorless) (purple) (colorless ...

The table shows the first four alkenes, their molecular formulae, displayed formulae, structural formulae as well as a drawing of their ball-and-stick constructional models.