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

Question

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

Peyton Adams · Accepted Answer

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

Hydrogen bonding occurs where HYDROGEN is bound to a strongly electronegative element, i.e. hydrogen is bound to fluorine, nitrogen, or oxygen. In #"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:

#"Normal boiling point,"# #HF=19.5# #""^@C#

#"Normal boiling point,"# #HCF_3=-82.1# #""^@C#

#"Normal boiling point,"# #CF_4=-127.8# #""^@C#

Can you explain the volatility in terms of the force between molecules?

Owen Ambrose · Answer

undefined Hydrogen bonding occurs between a hydrogen atom covalently bonded to an electronegative atom (such as nitrogen, oxygen, or fluorine) and another electronegative atom in a different molecule or in a different part of the same molecule. In the case of HCF3 (trifluoromethane), hydrogen bonding does not occur because there are no hydrogen atoms bonded to highly electronegative atoms.