Thank you for reporting, we will resolve it shortly
Q.
Which contains strongest $H$- bond?
Chemical Bonding and Molecular Structure
Solution:
The strongest hydrogen bond is in hydrogen fluoride because the power of hydrogen bond $\propto$ electronegativity of atom and electronegativity $\propto \frac{1}{\text{atomic size}}$
So fluorine has maximum electronegativity and minimum atomic size.