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CGP EDU Academic Team
Published on: August 14, 2026
In which of the following the hydrogen bonding is strongest. Explain briefly ?
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Very strong hydrogen bonding occurs in the alkali metal hydrogen fluorides of formula M[HF 2 ]; there is a linear symmetrical anion having an over all, F–H–F distance of 2.26 Å.
[F – H – – – F] – 
[F – – – H – F] –
F – + HF 
[FHF] – ; Δ H = – 161 ± 8 kJ mol –1
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