Among HF, HCl, HBr, HI: order of bond ENTHALPY (strength):
AAll equal
BHF > HCl > HBr > HI
CHCl > HF > HBr > HI
DHI > HBr > HCl > HF
Answer & Solution
Correct answer: B. HF > HCl > HBr > HI
As we go down the halogen group, bond length increases (atom size grows), so bond becomes WEAKER. So HF (shortest, strongest) > HCl > HBr > HI (longest, weakest). This is also why HI is the strongest acid in water (easiest to dissociate).
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