It burns exothermically
It is odourless.
It is a gas.
It has a low boiling point.
Alkanes with large molecules are not useful.
Small alkane molecules can be polymerized.
Crude oil does not contain small alkane molecules.
To meet the demand for small alkane molecules.
They all contain carbon.
They are renewable.
They produce pollutants when burnt.
They may cause acid rain.
I is substitution; II is addition
I is cracking; II is fractional distillation
I is fractional distillation; II is cracking.
I is decomposition; II is substitution
They have different densitites
They have different boiling points.
They have different solubilities in crude oil.
They have different viscosities.