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In this case they are n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. Any formula that goes by CnH2n+2 is an alkane. There isn't a formula you can use to find out how many isomers there are for any given class of molecules with a specified number of carbons. You just have to think very systematically when you try to find them all.
Another example of skeleton isomers is with molecular formula, C 5 H 12, there are three skeleton isomers; pentane, 2-methylbutane and 2,2-dimethylpropane. Stereoisomers which can be converted into one another by the rotation of a carbon-carbon sigma bond are called as conformational isomers.tructural isomers are compounds with the same molecular formula but different structures formula due to different manners of linking the atoms. Structural isomers can be five types.