Arrange the following in decreasing order of their boiling points: (I) n-Butane (II) 2-Methylbutane, (III) n-Pentane (IV) 2,2-Dimethylpropane

Arrange the following in decreasing order of their boiling points: (I

1.	Arrange the following in decreasing order of their boiling points: (I) n-Butane (II) 2-Methylbutane, (III) n-Pentane (IV) 2,2-Dimethylpropane
Answer» IgtIIgtIIIgtIV IIgtIIIgtIVgtI IVgtIIIgtIIgtI IIIgtIIgtIVgtI Solution :Boiling point of alkanes increases with INCREASE in molecular MASS and for the same alkane the boiling point decreases with branching. Thus, the DECREASING order of their boiling points is: `underset(III)("n-Pentane") gt underset((II))("2-Methylbutane")gt underset((IV))("2,2-Dimethylpropane")gtunderset((I))("n-Butane")`