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a
HF > HCI > HBr > HI: Bond dissociation enthalpy
b
HF > HCl > HBr > HI: Boiling point
c
HF > HCl > HBr > HI: Thermal stability
d
HF < HCI < HBr < HI: Acidic strength
answer is B.
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Detailed Solution
Correct B.pt. order:HF>HI>HBr>HCl(H-bonding in HF)Due to increased molar mass, dipole-dipole attracting (Vander Waal's forces) in HI, increases and hence B.Pt. HI is less than HF. Similarly B.Pt of HBr is less than HI but greater than HCl.