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Hydrogen bonding strength depends on electronegativity and size. F (in HF) forms the strongest hydrogen bonds due to its high electronegativity (4.0) and small size, unlike Cl, Br, or I.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Thermal stability of group 15 hydrides decreases down the group due to weaker X-H bonds. BiH₃ (Bi, largest) has the lowest stability among NH₃, PH₃, AsH₃, and BiH₃.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
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