(iii) Both A and R are not correct.
Explanation – Long chain hydrocarbon have higher boiling point than branched chain.
If branching increases than it decrease the boiling point. Branching decreases the surface area of alkanes due to this force of attraction between the molecule decreases. If we apply heat in branch chain hydrocarbon molecule it will separate easily due low molecular attraction. So, branch chain molecule boil easily than long chain.
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