F < Cl < Br < I is the correct arrangement in terms of :

Reactivity

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Atomic size

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Electronegativity

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Electron affinity

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Solution

The correct option is B
Atomic size

Atomic size increases down a group. All the elements are of group 17.

So, F < Cl < Br < I is the correct arrangement in terms of atomic size.
For reactivity and electronegativity, the correct order is F > Cl > Br > I.
For electron affinity, the correct order is Cl > F > Br > I.

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Arrange the following as per instructions given in the brackets.

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(d) Cl, F, Br, I (increasing electron affinity)

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