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Which of the following has the highest boiling point? 

(i) 2-Methylpentane 

(ii) 2, 3-Dimethylbutane 

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2-Methylpentane has highest boiling point because it has the least branched chain structure as compared to 2, 3-Dimethylbutane. Therefore, it has largest surface area and hence has the highest boiling point. 

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