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

1 Answer
Apr 6, 2017

Answer:

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 #"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 account for the volatilites in terms of intermolecular force?