Which of the hydrocarbons are arranged as per the increasing order of their boiling points ?
Methane, Butane, Propane, Heptane
Propane, Butane, Pentane, Octane
Propane, Butane, Heptane, Methane
Octane, Ethane, Methane, Propane
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This question was previously asked in
UPSC NDA-1 – 2023
For a homologous series of hydrocarbons like alkanes, the boiling point generally increases with increasing molecular weight, which corresponds to an increasing number of carbon atoms. This is because larger molecules have stronger van der Waals forces (London dispersion forces), requiring more energy (higher temperature) to overcome them and transition from liquid to gas phase.