Question

All combustion reactions are always exothermic which occur in the presence of an excess of air or oxygen. Substances acting as fuels undergo combustion when heated. It is not necessary that a particular substance undergoing combustion may burn also. The human body is just like a furnace or machine in which various foodstuffs that we eat undergo combustion. They provide the desired energy needed for the body's function.
What are the main constituents of L.P.G.?

Answer 1

L.P.G.

1. The full form of L.P.G. is Liquefied Petroleum Gas.
2. The main constituents of Liquefied Petroleum Gas are butane$\mathbf{\left(}{\mathbf{C}}_{\mathbf{4}}{\mathbf{H}}_{\mathbf{10}}\mathbf{\right)}$ and propane$\mathbf{\left(}{\mathbf{C}}_{\mathbf{3}}{\mathbf{H}}_{\mathbf{8}}\mathbf{\right)}$.
3. Propylene$\mathbf{\left(}{\mathbf{C}}_{\mathbf{3}}{\mathbf{H}}_{\mathbf{6}}\mathbf{\right)}$, butylene$\mathbf{\left(}{\mathbf{C}}_{\mathbf{4}}{\mathbf{H}}_{\mathbf{8}}\mathbf{\right)}$, and isobutane$\mathbf{\left(}{\mathbf{C}}_{\mathbf{4}}{\mathbf{H}}_{\mathbf{10}}\mathbf{\right)}$ may also be present in smaller amounts.
4. L.P.G. is widely used as cooking gas in households.

Therefore, the main constituents of L.P.G. are butane and propane in liquified form.