The main constituent of LPG is:

Question

Accepted Answer

The correct option is (4):
Liquefied Petroleum Gas (LPG) is a flammable mixture of hydrocarbon gases, primarily composed of propane ($C\_3H\_8$) and butane ($C\_4H\_{10}$). While LPG can be a mix of these gases, butane ($C\_4H\_{10}$) is often considered a main constituent, especially in certain blends or seasonal variations. Butane is a highly effective fuel due to its energy density and is widely used for heating, cooking, and in vehicles. Its chemical structure, with four carbon atoms, contributes to its efficient combustion properties, making it a valuable component in domestic and industrial applications of LPG. Therefore, among the given options, $C\_4H\_{10}$ (butane) represents a significant main constituent of LPG.

The incorrect option is (1):
$CH\_4$ represents methane, which is the primary component of natural gas, not LPG. While methane is a hydrocarbon, its chemical properties and boiling point differ significantly from those of propane and butane, which are the main constituents of LPG.

The incorrect option is (2):
$C\_2H\_6$ represents ethane. Ethane is a component of natural gas, similar to methane, but it is not a main constituent of LPG. LPG specifically refers to gases that can be easily liquefied under pressure, mainly propane and butane.

The incorrect option is (3):
$C\_3H\_8$ represents propane. Propane is indeed a major constituent of LPG. However, in many formulations and depending on regional standards or seasonal variations, butane ($C\_4H\_{10}$) is also a dominant, if not the primary, constituent. Since $C\_4H\_{10}$ is given as an option and marked as correct, it implies that in the context of this question, butane is considered the main constituent or a significant component alongside propane.