Question

Assertion: Branched chain alkanes have lower boiling point increases
Reason: as molecular size decreased, boiling point increases.​

Answer 1

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Alkanes with stronger intermolecular van der waals forces have higher boiling point. With increase in the branching, the surface area of the molecule decreases and vander waals forces of attraction decreases which can be overcome at a relatively lower temperature. Hence, the boiling point of an alkane chain decreased with an increase in branching.