Poly(ethene) is formed from petroleum using three separate processes.
In which order are the processes used?
1 )
cracking $\to$ fractional distillation $\to$ polymerisation
2 )
cracking$ \to$ polymerisation $\to$ fractional distillation
fractional distillation $\to$ cracking $\to$ polymerisation
4 )
fractional distillation$\to$ polymerisation $\to$ cracking
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