Question

Which of the following pairs are correct?

• A. Saturated compounds - yellow flame, Unsaturated compounds - clean or blue flame.
• B. Saturated compounds- clean or blue flame, Unsaturated compounds - yellow flame.
• C. Saturated compounds and unsaturated compounds both give yellow flame
• D. Saturated compounds and unsaturated compounds both give clean or blue flame

Answer 1

The correct option is B

Saturated compounds- clean or blue flame, Unsaturated compounds - yellow flame.

• Saturated hydrocarbons have a low percentage composition of carbon in them. So, the atmospheric oxygen is enough to burn all the carbon present. Therefore, these compounds give clean or blue flame.
  
• In unsaturated carbons, the percentage composition of carbon is high and the atmospheric oxygen is not enough to burn all the carbon present. The yellow flame is caused by the glow of hot unburnt carbon particles produced due to incomplete combustion..