Question

plzz guys I need ur help can define me when do we get a blue flame and yellow sooty flame

Answer 1

W get a blue flame during complete combustion i.e. in the presence of oxygen and we get a yellow sooty flame during incomplete combustion i.e. in the absence of oxygen.

Answer 2

When we burn Saturated compounds (aliphatic compounds) then we get a clean blue flame and when we burn Unsaturated Compounds containing double or triple bond then we get yellow and sooty flame.