JEE Main & Advanced Chemistry Hydrocarbons Question Bank Alkane

  • question_answer Which one of the following has the minimum boiling point [AIEEE 2004]

    A) 1-Butene

    B) 1-Butyne

    C) n-Butane

    D) Isobutane

    Correct Answer: D

    Solution :

    Among the isomeric alkanes, the normal isomer has a higher boiling point than the branched chain isomer. The greater the branching of the chain, the lower is the boiling point. The n-alkane have larger surface area in comparison to branched chain isomer (as the shape approaches that of a sphere in the branched chain isomers). Thus, intermolecular forces are weaker in branched chain isomers, there fore they have lower point in comparision to straight chain isomers.

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