How to calculate number of isomers of an organic compound?
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Unfortunately, there is no formula to calculate the number of structural isomers of an alkane. This is mainly due to the fact that with a certain number of carbons, they can branch out (although most are unstable and do not actually exist).
For example, the formula C4H10 represents both butane and 2-methylpropane (both are stable in similar SCTPs) :

The first ten are:
Number of carbons -> Number of structural isomers
0 -> 1
1 -> 1
2 -> 1
3 -> 1
4 -> 2
5 -> 3
6 -> 5
7 -> 9
8 -> 18
9 -> 35
10 -> 75
For example, the formula C4H10 represents both butane and 2-methylpropane (both are stable in similar SCTPs) :

The first ten are:
Number of carbons -> Number of structural isomers
0 -> 1
1 -> 1
2 -> 1
3 -> 1
4 -> 2
5 -> 3
6 -> 5
7 -> 9
8 -> 18
9 -> 35
10 -> 75
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