Which Compound has the Highest Boiling Point?

By Mandeep Kumar|Updated : July 22nd, 2022

1. Isobutane

2. Isopentane

3. n-Pentane

4. Neopentane

The temperature at which vapour pressure of a liquid becomes equal to the atmospheric pressure is termed as the boiling point of a liquid. Different liquids possess different boiling points due to the difference in n the intermolecular forces operating between the molecules of the liquid.

Answer: The compound which has the highest boiling point is n-Pentane.

N-Pentane is a clear colorless liquid with a petroleum-like odor. Its density is less than water hence it floats on water. Also, it is insoluble in water. Check the boiling points of the given compounds in the table given below:

Name of the Compound

Boiling Point

Isobutane

-11.72°C

Isopentane

27.8°C

n-pentane

36°C

Neopentane

9.5°C

Physical Properties of n-Pentane

The physical properties of n-pentane have been presented below:

  • Its melting point is lower than Neopentane and Isopentane.

  • It requires less energy than Neopentane and Isopentane to melt the solid.

  • Its molar mass is 72.151 g/mol.

Uses of Pentane

Pentane is used for various purposes such as:

  • It is used as a blowing agent.

  • It is used as a solvent in some pesticides.

  • It is used in liquid chromatography.

  • It is used in refrigerants.

  • It is used in Geothermal power stations as a binary fluid.

Summary:

Which Compound has the Highest Boiling Point?

N-Pentane has the highest boiling point. It is because it is a straight chain that fits well with the other molecules and forms tightly compacted layers that are harder to separate.

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