# Where, and how does hydrogen-bonding occur? Does such bonding occur in HCF_3?

Apr 6, 2017

Hydrogen bonding occurs where HYDROGEN is bound to a strongly electronegative element...........

#### Explanation:

Hydrogen bonding occurs where HYDROGEN is bound to a strongly electronegative element, i.e. hydrogen is bound to fluorine, nitrogen, or oxygen. In $\text{fluoroform}$, the hydrogen is bound to carbon not fluorine. The molecule is polar but does NOT display hydrogen bonding. And the best indicator for intermolecular forces is given by boiling point:

$\text{Normal boiling point,}$ $H F = 19.5$ ""^@C

$\text{Normal boiling point,}$ $H C {F}_{3} = - 82.1$ ""^@C

$\text{Normal boiling point,}$ $C {F}_{4} = - 127.8$ ""^@C

Can you account for the volatilites in terms of intermolecular force?