Which of the following compounds in petroleum can cause corrosion to parts of internal combustion engines and refineries?

Sulphur

The correct answer is option 2. Sulphur.

Sulphur is the compound in petroleum that can cause corrosion to parts of internal combustion engines and refineries.

Sulphur compounds, particularly hydrogen sulphide \((H_2S)\) and sulphur dioxide \((SO_2)\), can be present in petroleum.

When these sulphur compounds are burned during the combustion of fuels in internal combustion engines, they can lead to the formation of corrosive acids.

The corrosive acids can contribute to the corrosion of engine parts and various components in refineries.

Therefore, efforts are made to reduce the sulphur content in petroleum products to minimize the environmental impact and potential corrosive effects.