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The molecular formula of a homologue of butane is:

Butane is a member of homologous series of alkanes. The general formula of homologous series of alkanes is CnH2n+2. Where, n is the number of carbon atoms in the one molecule of alkane. Thus, C3H8 is a member of homologous series of alkanes.

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40 Describe how petroleum was formed in the earth. 40 Name a fossil fuel other than coal and petroleum. 42 One of the following molecular formula can represent two organic compounds having different functional groups. This molecular formula is : 43 The number of carbon atoms present in the molecule of fifth member of the homologous series of alkynes is: