Define isomerism. Write down the structures and names of isomers of butane.

Explanation

Two or more compounds having same molecular formula but different structural arrangements of atoms in their molecules are called isomers. This phenomenon is called isomerism.
`underset("iso-Butane")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(3))`
(IUPAC name : 2-Methylpropane)
`underset("n-Butane")(CH_(3)-CH_(2)-CH_(2)-CH_(3))`
(IUPAC name : Butane)