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a
HF > HCI > HBr > HI
b
HF < HCI < HBr < HI
c
HCl > HF > HBr > HI
d
HCI > HBr > HF < HI
answer is B.
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Detailed Solution
The decreasing order of the reducing character is HI>HBr>HCl>HFThe stability of hydrogen halides decreases on moving from HF to HI, the reducing property increases on moving down the group. Thus, HI is the strongest reducing agent and HF is not a reducing agent.