Question

Which contains strongest $H$- bond?

• A. $O-H.....S$
• B. $S-H......O$
• C. $F-H......F$
• D. $F-H......O$

Answer 1

Answer: (C)

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.