What are structural isomers ? Draw two structural isomers of butane.

Explanation

Molecules that have same chemical formula but different spatial arrangement of their constituent atoms are called structural isomers.
The isomers of butane are:
`underset(C_4H_10)underset("Butane")(H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-H) " " underset(C_4H_10)underset("Isobutane")(H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)underset(H-C-H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-H`