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9. Hydricarbon — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
Which one of the following has the minimum boiling point
  • A
    $1-$Butene
  • B
    $1-$Butyne
  • C
    $n-$Butane
  • ✓
    Isobutane
✓

Answer

Correct option: D.
Isobutane
d
(d)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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