Question

Isomeric pentanes have different value of boiling point for example, n-pentane has highest the boiling point among it three isomers. This is due to
A. no branching
B. weak intermolecular force of attraction
C. large area of contact
D. None of the above

Answer 1

Correct Answer - C
With increase in number of branched chains, the molecules attains the shape of a sphere. This results in smaller area of contact and therefore weak intermolecular forces between spherical molecules, which are overcome at relatively lower temperatures.