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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.
The parent siloxanes include the oligomeric and polymeric hydrides with the formulae H(OSiH 2) n OH and (OSiH 2) n. Siloxanes also include branched compounds, the defining feature of which is that each pair of silicon centres is separated by one oxygen atom.The siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane. The functional group (RO) 3 Si is called siloxy.he siloxane functional group forms the backbone of silicones, the premier example of which is polydimethylsiloxane.