For the halogens, which is correct order for decreasing activity?

C l, I, B r

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C l, F, B r, I

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F, C l, B r, I

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C l, B r, I, F

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Solution

The correct option is B $F, C l, B r, I$
For the halogens the correct order for decreasing activity is $F > C l > B r > I$ .
This is due to following factors.
(a) Successive increase in atomic size on moving down the group.
(b) Successive decrease in electronegativity on moving down the group.
(c) Successive decrease in the oxidizing power.

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