Question

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

• A. True
• B. False

Answer 1

The correct option is A

True

This statement is true. Saturated hydrocarbons have a low percentage composition of carbon in them, so the atmospheric oxygen is enough to burn all the carbon present. Hence, they burn with a blue flame.
Whereas, in the unsaturated hydrocarbons, the percentage composition of carbon is high and atmospheric oxygen is not enough to burn all the carbon present. Hence, unburnt carbon particles are present in the flame giving it a sooty feel.