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A hydrogen bond is best described as the attraction between H attached to a highly electronegative atom and:
AA lone pair on F, O or N nearby
BA delocalised π electron cloud
CA roving free proton
DA flat metallic surface
Answer & Solution
Correct answer: A. A lone pair on F, O or N nearby
1. A H-bond forms when H is bonded to a small, highly electronegative atom (F, O, N).
2. The H carries a large δ⁺ and is attracted to a lone pair on another F/O/N atom.
3. This explains the anomalously high boiling points of H₂O, HF and NH₃.
_Source: NCERT Class 11 Chem Ch 4 §4.8 Hydrogen Bonding_
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