Question

What is isomerism ? Write isomers of butane and pentane.

Page 214 Chapter - 10. Mineral Coal and Minerak Oil

Answer 1

Isomerism is the property , by virtue if it carbon compounds have different structures but same molecular formula.
Isomers of butane
n-butane
iso-butane
Isomers of pentane
n-pentane
iso-pentane
neo-pentane

Answer 2

Isomerism, the existence of molecules that have the same numbers of the same kinds of atoms (and hence the same formula) but differ in chemical and physical properties.

Pentane has three structural isomers that are n-pentane, Iso-pentane (methyl butane) and neopentane (dimethylpropane).