Question

Under what conditions an oxidation reaction can be called as combustion reaction ? Illustrate your answer with examples.

Answer 1

Oxidation reaction involves loss of electrons/addition of oxygen/removal of hydrogen.
Combustion reaction involves burning of substance in presence of oxygen and release of energy in the form of heat , light etc
1.Oxidation reaction can be called as combustion reaction  only when they release energy in the form of heat, light etc.
For example:
CH4+2O2 ------>CO2 +2H2O + Energy

2. Generally all hydrocarbons show the property of combustion oxidation reaction.

Answer 2

When complete oxidation of fuel takes place,it is called combustion reaction. It is highly exothermic and generally accompanied by heat and light.

For example: CH4(g)+2O2(g)=CO2(g)+2H2O(g)

This reaction is combustion because CH4 burns in excess of oxygen to form carbon dioxide and water.