According to the NCERT text, the boiling point of alkanes decreases with an increase in branching. For the isomeric pentanes, n-pentane has a continuous chain of five carbon atoms and the highest boiling point (309.1 K), while the highly branched neopentane (2,2-dimethylpropane) has the lowest (282.5 K), making the order n-Pentane > Isopentane > Neopentane correct . With an increase in the number of branched chains, the molecule attains the shape of a sphere. This results in a smaller area of contact and therefore weak intermolecular van der Waals forces between the spherical molecules, which are overcome at relatively lower temperatures, thereby lowering the boiling point . Therefore, both Statement I and Statement II are true.