Question: Arrange the following compounds in order of increasing boiling point.

Some factors which affect the boiling point of a compounds. These are mentioned below:

• As the number of carbon atoms increases, the boiling point also increases.
• As the branching increases, the surface area decreases, and hence the boiling point also decreases.

The given compounds are shown below:

Given compounds

The simple chain compounds are octane and heptane. Octane has more carbon atoms, which means it has the highest boiling point than others. Thereafter, the boiling point of heptane would be higher than the remaining two compounds.

The increasing order of boiling point is illustrated below:

Order of boiling point of octane and heptane

The branched compounds are 2,2,3-trimethylbutane and 2-methylhexane. The compound 2,2,3-trimethylbutane has more branching than 2-methylhexane. Thus, the surface area of 2,2,3-trimethylbutane is less than 2-methylhexane.

Hence, the boiling point of 2,2,3-trimethylbutane is less than 2-methylhexane. The overall order of increasing boiling point is shown below: