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  4. Which one shows maximum hydrogen bonding?

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Q. Which one shows maximum hydrogen bonding?

AIPMTAIPMT 1990Chemical Bonding and Molecular Structure

Solution:

Hydrogen bonding oc electronegativity
$\propto \frac{1}{\text { Size of atom to which H is covalently bonded}}$
Since, $F$ is most electronegative and has smaller size,
$HF$ shows maximum strength of hydrogen bond.