What type of structural isomerism is shown by alkanes

Alkanes exhibit chain isomerism, a type of structural isomerism. This occurs when the carbon atoms in the molecule are arranged in different ways, forming different 'chains'. For example, the alkane with the molecular formula C4H10 can exist as two different isomers: butane and 2-methylpropane. In butane, all four carbon atoms are arranged in a straight chain, while in 2-methylpropane, three of the carbon atoms are arranged in a chain with the fourth attached to the second carbon in the chain.