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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 three isomers of toluidine, which are organic compounds. These isomers are o-toluidine, m-toluidine, and p-toluidine. The o-stands for ortho -, m-stands for meta - , and p-stands for para - .he difference between these three isomers is the position where the methyl group (-CH 3) is bonded to the ring relative to the amino functional group (-NH 2); see illustration of the chemical structures below.