How does the supply of air affect combustion of saturated hydrocarbons?

Question

(a) How does the supply of air affect combustion of saturated hydrocarbons?
(b) What is indicated by:  

(i) sooty flame  (ii) blue flame of a bunsen burner?
(c) Why are holes provided at the bottom of a bunsen burner?

Answer 1

(a) If air supply is not sufficient, saturated hydrocarbons give yellow sooty flame.
(b) (i) Yellow sooty flame-Burning of unsaturated hydrocarbons such as ethene and ethyne incomplete combustion (anyone),
(ii) Blue flame-Burning of saturated hydrocarbons/complete combustion.
(c) Holes let the supply of air to be adjusted for complete combustion.