ANS:C - Aniline point

Among the options provided, Aniline point is not typically considered an important property of fuel oil or furnace oil. Here’s why:

1. Sulphur Content: The sulphur content in fuel oil is crucial because it affects combustion emissions and environmental regulations. Higher sulphur content can lead to increased emissions of sulphur dioxide (SO2) when burned.
2. Viscosity: Viscosity is important as it determines the flow characteristics of fuel oil, which can impact handling, storage, and combustion efficiency.
3. Flash Point: Flash point is the temperature at which fuel oil vaporizes enough to form a flammable mixture with air. It is essential for safety considerations during storage, handling, and transportation of fuel oil.
4. Aniline Point: Aniline point is more relevant for lighter hydrocarbon fractions like gasoline and diesel, where it indicates the solvency of the fuel with respect to certain aromatic compounds. It is less commonly used or considered critical for heavier fuel oils like furnace oil.