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Hydrogen fluoride shows strongest hydrogen bonding due to high electronegativity of fluorine.

1. H-C≡C*-O-H
2. The star marked carbon has a valency of 5 and hence this formula is not correct.
3. As F is most electronegative thus HF shows maximum strength of hydrogen bond.
4. With the increase of electronegativity and decrease in size of the atom to which hydrogen is covalently linked, the strength of hydrogen bond increases.

Correct answer: As F is most electronegative thus HF shows maximum strength of hydrogen bond.

Solution

Hydrogen fluoride (HF) exhibits the strongest hydrogen bonding because fluorine is the most electronegative element, creating a highly polar bond and strong intermolecular forces.

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