Constitutional Isomers

[Demo0710]

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Is there a formula to calculate the number of possible isomers? Or any strategy other than by just drawing them out?

 

[Mr. Thirsty]

It depends on what you are talking about. If you specifically mean "constitutional" isomers then no there is no formula that I know of. For stereoisomers however it is 2^n (n= # of chiralty centers or cis/trans atoms)