In this question, we are asked to identify which of the options is not a chemical change. A chemical change refers to a process where the substances involved undergo a transformation at the molecular level, resulting in the formation of new substances with different properties.

Option 1, the burning of coal in air, is a chemical change. This process involves the combustion of coal, which results in the release of heat energy and the formation of carbon dioxide and water vapor.

Option 2, the fermentation of sugarcane juice, is also a chemical change. Fermentation is a biological process where sugars are broken down by microorganisms, such as yeast, into alcohol and carbon dioxide.

Option 3, the crystallization of table salt from seawater, is not a chemical change. It is a physical change. During the process of crystallization, the water is evaporated, leaving behind the salt crystals. The composition of the salt remains the same, only the physical form changes.

Option 4, the cracking of petroleum, is a chemical change. Cracking involves the breaking down of larger hydrocarbon molecules into smaller ones, such as the conversion of heavy petroleum fractions into gasoline. This process alters the structure and composition of the molecules, resulting in the formation of different hydrocarbon compounds.

Therefore