explain isomerism. state any four characteristics of isomers.

Isomerism: Compounds having same molecular formula but different structural formula and also differ in their properties are called isomers and this phenomenon is termed as isomerism.

For example: Butane and iso-butane are two isomers. In these compounds molecular formula - is same but structural formula is different.

For Butane - 

For iso-butane -

Characteristics of isomers:

1.  They have same molecular formula but different structural formula. 

2.  Two isomers can have different boiling points. 

3. Isomers have same atomic weight and same number of atoms.

4.  They show similar properties only when they contain same functional group.