Question

"n-pentane has lesser boiling point than neopentane"

Answer 1

n-Pentane have a higher boiling point than neopentane. The shape of n-pentane, a straight chain, fits well together with other n-pentane molecules, forming tight, well-compacted layers, which are harder to separate. In neopentane, which is 2,2-dimethylpropane, trying to fit neopentane molecules together is difficult because of the substituents. Because of this uneven "packing" it becomes easier to separate and boiling point is lower.