The correct order of increasing intermolecular hydrogen bond strength is

Question

Canvas Classes · Accepted Answer

Hydrogen bond strength depends on the electronegativity of the atom bonded to H and the size of the atom.

Step 1 — Classify each molecule:

- : No H-bonding (C is not electronegative enough) → weakest
- HCN: C≡N–H... weak H-bonding (N is electronegative but C–H bond is weak donor)
- : N–H...N H-bonding (N is electronegative, direct N–H)
- : O–H...O H-bonding (O is more electronegative than N → stronger H-bond)

Step 2 — Increasing H-bond strength:

But the question asks from the given options.

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