Which of the following has highest boiling point?

(1) 2-methyl pentane. 

(2) 2, 3-diethyl butane. 

(3) 2, 2- dimethyl butane

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1 Answers

As the branching increases, surface area decreases and thus magnitude of Vander Waals forces of attraction decreases and hence the boiling point decreases. So, 2-methyl pentane has highest B.pt.

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