Canadian Entry To Practice (CETP) Practice Test 2026 - Free CETP Practice Questions and Study Guide

The correct choice is butane. Butane, like propane, is a hydrocarbon gas that can be used for heating, cooking, and other applications. Both propane and butane belong to the family of alkanes, which makes them chemically similar and allows for some interchangeability in applications, particularly in heating and fuel systems.

With minor modifications to the equipment, such as changing the regulator or orifice sizes, butane can be used in place of propane without compromising performance. This flexibility is crucial in many heating and cooking applications, especially in regions where one type of fuel may be more accessible or economical than the other.

Natural gas, which is primarily composed of methane, differs significantly in its delivery pressure and combustion properties, requiring more extensive equipment modifications to switch from propane. While gasoline is a liquid fuel often used in vehicles, it is not classified in the same category as gases like propane and butane and cannot be directly interchanged under similar conditions. Therefore, butane is the appropriate choice for interchangeability with propane after minor equipment modifications.