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Thermal Decomposition or Pyrolysis or Cr...

Thermal Decomposition or Pyrolysis or Cracking.

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Alkanes on heating to 770-870 K, decompose into smaller molecules. This thermal decomposition of alkanes is known as Pyrolysis or cracking, e.g.,
`underset("n-Butane")(CH_(3)CH_(2)CH_(2)CH_(3))overset(770K)(to)H_(2)+underset("Butene")(C_(4)H_(8))+underset("Methane")(CH_(4))+underset("Propene")(C_(3)H_(6))" or "underset("Ethane Ethene")(C_(2)H_(6)+C_(2)H_(4))`
The nature of products depends upon (i) the structure of the starting alkane, (ii) the pressure under which cracking is carried out and (iii) the presence or absence of catalysts.
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