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formula of no.of possibule isomers in alkans
There donot exist a formula for counting chainisomers. However for quick remembring u can use the following concept for first 9 alkanes
For each consequetive memeber , the no of chain isomers is of 2n-1 where n is the no of isomers of preceding member
Carbon atoms - Isomers
4 - 2 (Buane has 2 isomers)
5 - 3 (2*2-1)
6 - 5 (2*3-1)
7 - 9 (2*5-1)
8 - 18 (exception 2*9)
9 - 35 (2*18-1)
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