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Q.
Which of the following has maximum b.pt.?
Hydrocarbons
Solution:
The $n$ -alkanes have most extended structure and larger surface area in comparison to branched chain isomers having compact structure. Thus, intermolecular forces are weaker in branched chain isomers, therefore they have lower boiling points in comparison to straight chain isomers. Higher the branching lower will be the boiling point.