Which one of the following has the minimum boiling point - Vidyadip

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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