Which one of the following has the minimum boiling point?
Which one of the following has the minimum boiling point?
(a) n-butane
(b) 1-butyne
(c) 1-butene
(d) isobutene.
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(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-alkanes have larger surface area in comparison to branched chain isomers (as the shape approaches that of a sphere in the branched chain isomers). Thus, intermolecular forces are weaker in branched chain isomers, therefore, they have lower boiling points in comparison to straight chain isomers.
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