Isomerization

Alkenes when heated alone at high temperatures (500-700^°C) or at lower temperatures (200-300^°C) isomerizes in the presence of catalyst, such as Al₂(SO₄)₃. Alkenes isomerism due to,

•             The shifting of the double bond which tends to move towards the center of chain, e.g., pentene-1 isomerizes to pentene-2.

•  The migration of a methyl group, e.g., butene-1 isomerizes to 2-methylpropene (iso-bute