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Figure 1 shows the structural formulae of a molecule of propane and of a molecule of butane. Propane and butane are neighbouring members of the same homologous series.

PropaneButane
Structural formula of a propane molecule, consisting of a chain of 3 carbon atoms single-bonded to each other, with each carbon bonded to hydrogen atoms to make a total of 8 hydrogen atoms, C3H8Structural formula of a butane molecule, consisting of a chain of 4 carbon atoms single-bonded to each other, with each carbon bonded to hydrogen atoms to make a total of 10 hydrogen atoms, C4H10

Explain, using these structural formulae, why propane and butane are neighbouring members of the same homologous series.

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