Among the following select the alkane that is expected to have lowest boiling point

Options

A. hexane
B. 2-methylpentane
C. 3-methylpentane
D. 2,2-dimethylbutane

Answer

D

Explanation

As the number of carbon atom increases , the boiling points of alkane increase because van der waal's force increases . However , branching results in decrease in boiling point due to decreased surface area which results in weaker van der waals' forces . thus , order of boiling points of given alkanes is