Differences Between Alkane and Alkene

Table below shows the difference between alkane and alkene.

Alkane Alkene
General Formula CnH2n+2 CnH2n
Types of hydrocarbon Saturated Unsaturatd
Combustion Less sooty flame when burnt Sootier flame when burn
Reaction with bromine liquid No change observed The reddish brown colour of bromine become colourless
Reaction with potassium manganete(VII) No change observed The purple colour of potassium manganete(VII) become colourless

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Testing for unsaturated hydrocarbons

[This video shows the reaction between bromine with cyclohexane (an alkane) and cyclohexene (an alkene). Observe the change of the colour of bromine when dropped into cyclohexane and cyclohexene]

Alkene test


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