Question

Why can't we have isomers of first three members of the alkane series?

Answer 1

Isomers having same molecular formula but diiferent structural arrangement . Isomer is only possible in 4 carbon atoms becoz only then , two or more arrangement or different arrangement are possible and thats why no isomerism is possible in alkane series of three members metane , ethane , and propane becoz they contain only one , two or three carbon atom .