Question

Arrange the following compounds in increasing order of their boiling points.

(a) (ii) < (i) < (iii) (b) (i) < (ii) < (iii)

(c) (iii) < (i) < (ii) (d) (iii) < (ii) <(i)

Answer 1

Answer: (c) (iii) < (i) < (ii)

Boiling points of isomeric haloalkanes decrease with increase in branching as with the increase in branching surface area decreases which leads to decrease in intermolecular forces.

In-other-words, more branches compound has less boiling point whereas fewer branches compound has more boiling point.