In this type of questions, a statement of assertion 
is followed by a statement of reason
(R). Mark the correct choice as:
Assertion : Branched chain alkanes have lower boiling point.
Reason : As molecular size increases, boiling point increases.
Text Solution
Verified by ExpertsB
The 
-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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