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Bond length is shortest for a triple bond, middle for a double bond, and longest for a single bond. For single bonds, the example HF,HCl,HBr,HI helps further explain bond length. As you move down the halogen family there are more electrons and a larger atomic radius causing more distance between the two atom centers. This would cause H-halogen bonds to increase in length down the family. As bond length increases, bond strength also decreases. I hope this helps.
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