Which of the following is NOT one of the six LPG gases?

The correct answer is methanol, as it is not categorized as one of the liquefied petroleum gases (LPG). LPG typically consists of hydrocarbons that are gaseous at room temperature, primarily butane, isobutane, propane, and propylene. These gases are derived from crude oil refining and natural gas processing.

Methanol, on the other hand, is an alcohol and is fundamentally different from LPG in terms of its chemical structure and properties. It does not share the same applications or characteristics as the LPG gases, which are often used as fuels for heating, cooking, and automotive purposes. This distinction is why methanol is excluded from the classification of LPG gases.