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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 can be several structural formulas for a single molecular formula. These are known as isomers. Isomers can be defined as âdifferent compounds that have the same molecular formula.â There are mainly two types of isomers called constitutional isomers and stereoisomers. For example, C 4 H 10 can have following constitutional isomers.