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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.
There are two compounds having the molecular formula C4H10, which differ only in the way the atoms are connected. to one another. Molecules which have the same molecular formula, but different connectivities among the constituent. atoms, are called structural isomers. The structural isomers having the formula C4H10 are shown below. Note that. the prefix âisoâ means âsameâ, so isobutane received its name because it has the same formula as butane.