Which of the following factor is used for the separation of petroleum?

The separation of petroleum is done based on the difference in the boiling points of substituents. A process to be used is fractional distillation. The differences in the boiling points of the liquids make it possible to condense the liquids at various points of the fractionating column.

Freezing point and Melting point are not required in the Distillation process. Ignition temperature is the lowest temperature at which a substance starts burning. Ignition temperature is not related to distillation, it is required for the combustion process.

So, the correct answer is -' Boiling Point'.