Relative strength of acids are

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HF < HCI < HBr < HI

HF > HCI > HBr > HI

HCl < HF < HBr < HI

HI < HBr < HF < HI

answer is A.

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Detailed Solution

As going down the group, the size of halogen increase so the HX bond becomes weaker.Thus, acidic strength is HF < HCl < HBr < HI

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