# Question #d570d

Mar 30, 2017

greater is the mass of the molecule greater is its boiling point.

#### Explanation:

boiling point of polar molecules is always greater than that of nonpolar molecules due to the presence of electrostatic forces.

Among polar molecules, greater the net dipole moment in the molecule greater is the boiling point (provided that other aspects are similar in the comparing molecules).

Among non- polar molecules,
boiling point $\propto$ number of carbon atoms
boiling point $\propto$ 1/(branching in the principle chain)

However, intramolecular 'H' (hydrogen) bonding reduces the boiling point, while intermolecular H bonding increases the boiling point. (inter/intra molecular H bonding affects the shape of the molecule, example- formation of Dimer, trimer due to H bonding)