Question

Hydrogen bond is strongest in:

• A. $HF$
• B. $HCl$
• C. $HBr$
• D. $Hl$
• E. $HAl$

Answer 1

Answer: (A)

$HF$

A hydrogen bond is the electrostatic attraction between polar groups that occurs when a hydrogen $\left(H\right)$ atom bound to a highly electronegative atom such as nitrogen$\left(N\right)$, oxygen $\left(O\right)$ or fluorine $\left(F\right)$ experiences attraction to some other nearby highly electronegative atom.

$F$ is the most electronegative atom and thus forms the strongest hydrogen bond in $HF$.