The normal boiling points of some group 7A hydrides are tabulated below.$$\begin{array} { l l }
\text { Gas } & \mathrm { BP } \left( { } ^ { \circ } \mathrm { C } \right) \
\hline \mathrm { HF } & 19.7 \
\mathrm { HCl } & - 84.8 \
\mathrm { HBr } & - 66.4
\end{array}$$
Which of the following intermolecular forces or bonds is responsible for the high boiling point of HF relative to HCl and HBr?
A) Hydrogen bonding
B) Dipole-induced dipole force
C) Induced dipole-induced dipole force
D) Covalent bonding
E) Ion-induced dipole force

Question

The normal boiling points of some group 7A hydrides are tabulated below.$$\begin{array} { l l } 
\text { Gas } & \mathrm { BP } \left( { } ^ { \circ } \mathrm { C } \right) \
\hline \mathrm { HF } & 19.7 \
\mathrm { HCl } & - 84.8 \
\mathrm { HBr } & - 66.4
\end{array}$$
Which of the following intermolecular forces or bonds is responsible for the high boiling point of HF relative to HCl and HBr?
A) Hydrogen bonding
B) Dipole-induced dipole force
C) Induced dipole-induced dipole force
D) Covalent bonding
E) Ion-induced dipole force

Quizplus · Accepted Answer

Hydrogen bonding is responsible for the high boiling point of HF compared to HCl and HBr, as HF forms strong hydrogen bonds due to the high electronegativity of fluorine.

The Normal Boiling Points of Some Group 7A Hydrides Are