Question

Saturated hydrocarbons burn with blue flame and unsaturated hydrocarbons burn with a yellow sooty flame.

• A. True
• B. False

Answer 1

The correct option is A True

Saturated hydrocarbons have a low percentage composition of carbon in them. The atmospheric oxygen is enough to burn all the carbon present in it and hence, they burn with a clean blue flame. In saturated hydrocarbons complete combustion of the fuel takes place.

Whereas, in unsaturated hydrocarbons, the percentage composition of carbon is higher than the saturated hydrocarbon and atmospheric oxygen is not enough to burn all the carbon present in it. The yellow flame is caused by the glow of hot unburnt carbon particles produced due to the incomplete combustion of an unsaturated hydrocarbon.