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Hydrocarbons — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons3 Marks
Question
What effect does branching of an alkane chain has on its boiling point?
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Answer

As the branching in an alkane increases, the shape of the molecule approaches a sphere and size of the branched chain alkane becomes less than that of its straight chain counterpart. The reduced surface area results in decreased van der Waals' interaction and finally leads to lower boiling point as compared to straight chain alkanes of comparable molar mass.

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