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B
I > Br > CI > F
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C
I > CI > Br > F
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D
CI > F > Br > I
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Solution
The correct option is AF > CI > Br > I It decreases on moving down the group because size of atom increases. Decreasing order of electro-negativity of halogens is F, Cl, Br, I. Fluorine has highest electronegativity among all the known elements.