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What happens when ethylene gas is heated...

What happens when ethylene gas is heated at high pressure and high temperature in the presence of suitable catalyst ?

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When ethylene gas is heated at high pressure and high temperature in the presence of suitable catalyst, it polymerizes to form polyethylene or polythene (plastic).
`underset("Ethylene")(nCH_(2))=CH_(2)underset("Catalyst")overset("Heat, high pressure")to underset((n=100 " to "1000))underset("Polythene or Polyethylene")((-CH_(2)-CH_(2)-)_(n))`
`.....CH_(2)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-CH_(2)...` etc.
`overset(OR)(-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-)`
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