The order of the bond lengths is HF - HC l - HBR - HI. A stronger acid than HF is HCl. Fluorine is both smaller and more electronegative than chlorine.
As we move down the periodic table, the strength of bonds between hydrogen and atoms in the same column decreases. As a result, an H-F bond is more powerful than an H-I bond, while H-C is more powerful than H-Si, H-N is more powerful than H-P, H-O is more powerful than H-S, and so on. This is due to the fact that as one of the atoms gets bigger, the region of space where two atoms share electrons gets proportionally smaller.
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