Arrange the following in decreasing order of their boiling points. (A) n-butane (B) 2-methylbutane (C) n-pentane (D) 2,2-dimethylpropane

Arrange the following in decreasing order of their boiling points. (A

1.	Arrange the following in decreasing order of their boiling points. (A) n-butane (B) 2-methylbutane (C) n-pentane (D) 2,2-dimethylpropane
Answer» `A gt B gt C gt D` `B gt C gt D gt A` `D gt C gt B gt A` `C gt B gt D gt A` Solution :Boiling POINT is DIRECTLY PROPORTIONAL to molar mass and surface area. It decreases on branching because surface area decreases. HENCE, n-pentane has the highest and n-butane has the lowest boiling points and in REST two branching is there, therfore , 2-methy butane has higher boiling point than 2,2-dimethylpropane.