JEE Advance - Chemistry (2014 - Paper 2 Offline - No. 6)

Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure.

JEE Advanced 2014 Paper 2 Offline Chemistry - Basics of Organic Chemistry Question 20 English

The correct order of their boiling point is

I > II > III

III > II > I

II > III > I

III > I > III

As the branching increases, the boiling point decreases. This is because the van der Waals forces of attraction decrease.