Answer:
The correct answer is option a.
Explanation:
When an hydrocarbon reacts with an excess of oxygen gas it gives water, carbon dioxide and heat as a product. This type of reaction termed as Combustion reaction.
Saturated hydrocarbon with single bond between carbon carbon atom give no soots during combustion reaction where unsaturated hydrocarbon with double or triple bonds between carbon carbon atom give soots during combustion reaction.
When methane reacts oxygen it gives carbon dioxide and water.
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
