Question

What is chain isomerism? Write the formulae of the two-chain isomers of Butene.

Answer 1

Part: 1

1. Chain isomerism appears because of the difference in the arrangement of the Carbon chain within the molecule.
2. If two compounds with the same molecular formula have a different main chain, then they show chain isomerism.

Part: 2

1. The chemical formula is ${\mathbf{C}}_{\mathbf{4}}{\mathbf{H}}_{\mathbf{8}}$.
2. The isomeric forms are But-1-ene (${\mathbf{H}}_{\mathbf{2}}\mathbf{C}\mathbf{=}\mathbf{CH}\mathbf{-}{\mathbf{CH}}_{\mathbf{2}}\mathbf{-}{\mathbf{CH}}_{\mathbf{3}}$) and But-2-ene (${\mathbf{CH}}_{\mathbf{3}}\mathbf{-}\mathbf{CH}\mathbf{=}\mathbf{CH}\mathbf{-}{\mathbf{CH}}_{\mathbf{3}}$)