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Why are liquid products of cracking sent to a fractionating column?

I am not sure on the answer, can anyone tell me or guide me? It is from OCR Gateway Chemistry C1
Reply 1
If it needs fractionally distilling, it must be a mixture. Cracking, therefore must make a mixture.

If you have a long chain and you crack it, where on the chain will it crack. All carbon - carbon bonds are the same (near as damn it), so the chain might break anywhere, producing a mixture of products that will need separating.

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