Question

How and why some longer alkanes are cracked?

Answer 1

Answer:

Cracking is a reaction in which larger saturated hydrocarbon molecules are broken down into smaller, more useful hydrocarbon molecules, some of which are unsaturated: the products of cracking include alkanes and alkenes , members of a different homologous series.

first 10 alkenes

Ethene (C2H4)

Propene (C3H6)

Butene (C4H8)

Pentene (C5H10)

Hexene (C6H12)

Heptene (C7H14)

Octene (C8H16)

Nonene (C9H18)

Answer 2

Answer:

They are cracked by heat.

Explanation:

The longer alkanes are heated and their vapours are passed over a hot catalyst . This causes covalent bonds to break and reform

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