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By how many -CH2- (methylene) units do t...

By how many `-CH_2-` (methylene) units do the formulae and the first two members of homologous series of alkane, methane `(CH_4)` and ethane `(C_2H_6)` differ? Similarly, by how many `-CH_2-` Units do the neighbouring members ethane `(C_2H_6)` and propane `(C_3H_8)` differ from each other?

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Methane and ethane differ by one `-CH_(2^(-))` unit. Also in ethane and propane differ by one `-CH_2-` unit.
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