The boiling point of HF is lower than that of water despite the fact that the hydrogen bonds in HF are at least as strong as those in water because:

Question

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Each water molecule can form up to four hydrogen bonds due to its tetrahedral shape: two through its hydrogen atoms and two through its lone pairs on oxygen. This extensive hydrogen bonding network in water leads to a higher boiling point compared to HF, which can typically form only two hydrogen bonds per molecule (one as a hydrogen donor and one as a fluoride acceptor).

The Boiling Point of HF Is Lower Than That of Water