By how many -CH2- (methylene) units do the formulae of the first two members of homologous series of alkanes, methane (CH4) and ethane (C2H6) differ? Similarly, by how many -CH2- Units do the neighbouring members ethane ( C2H6 ) and propane ( C3H8) differ from each other?
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By order, Meth, Eth, Prop.
Hence Methane and Ethane differ by 1 methylene unit.
Ethane And Propane similarly differ by 1 methylene unit.
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Meth , Eth , Prop , But , Pent
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