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Question

Bond strength of Hydrogen halides decreases in the order:

A
HF>HI>HBr>HCl
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B
HCl>HF>HBr>HI
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C
HF>HCl>HI>HBr
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D
HF>HCl>HBr>HI
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Solution

The correct option is D HF>HCl>HBr>HI
Due to decrease in electro negativity bond strength of halo acids decreases from F to I. What is electronegativity? It can be viewed as the ability of the atom to pull electrons. Fluorine, being the most electronegative atom and having a small atomic size, tends to form very strong bond with the Hydrogen atom. Two smaller atoms have a greater tendency to overlap than a small Hydrogen atom and a bigger atom.
Therefore bond strength of halo acids decreases in the order HF>HCl>HBr>HI.

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