What are isomers? “Isomers of the first three members of alkane series are not possible”. Give reason to justify this statement and draw structures of two isomers of butane, C4 H10.

• Isomers: Compounds which have same molecular formula and different structural formula.
• In first three members of alkane series, branching is not possible, therefore isomers are not possible.
• Two isomers of butane C4H10.