The simpler molecules obtained are the useful hydrocarbon molecules among them some of which are unsaturated molecules. Thermal cracking or simply cracking involves breaking down complex organic molecules that are long chain hydrocarbons into smaller components that are lighter hydrocarbons by the process involving breakage of carbon – carbon double bonds present in the precursors. Now, here in this question cracking process is nothing but the application of heat energy to break the bonds and which yield the simpler molecules. In the lower classes, we have come across the petrochemicals and the process of producing various petroleum products based on fractional distillation too. Hint: The answer to this question here is based on the basic concept of chemistry which includes the fact that cracking is nothing but thermal decomposition which gives simpler products on decomposition.
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