Question

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

Answer 1

$\text{Relation between boiling point and surface area}$

• Strength of intermolecular forces is directly proportional to the surface area of the compound.
• Boiling point of a compound depends upon the surface area. Higher the surface area, higher will be the boiling point of a compound.
• Surface area decreases with increase in branching. If the compound has larger branching, then its boiling point will be lower.

$\text{Order of boiling point}$

Compound $\left(a\right)$ is secondary alkyl bromide which have less branching less than compound $\left(c\right)$ which is tertiary alkyl bromide and have more branching than compound $\left(b\right)$ which is primary alkyl bromide.

The increasing order of branching $c>a>b$.
Thus, increasing order of surface are $b>a>c$.


Therefore, correct option is $\left(C\right)$.