List in order of increasing boiling point NF3 NH3 CH4Solutio

List in order of increasing boiling point: NF3 NH3 CH4

Solution

The boiling point of NF₃ is -129.06⁰C. In NF₃, the molecules are held together by dipole-dipole forces and they are very much weaker than covalent bonds and moreover less energy is needed to overcome the intermolecualr forces.

The boiling point of NH₃ is -33.34⁰C. NH₃ is polar and can form hydrogen bonds.

The boiling point of CH₄ is -161.5⁰C. CH₄ molecule can form weak attractions via dispersion forces. It does not have H-bonds.

Hence, the oreder of increasing boiling points will be :

CH₄ < NF₃ < NH₃