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a
Bromine
b
Chlorine
c
Fluorine
d
Iodine
answer is D.
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Detailed Solution
Atomic radius trend….FCl>Br>I;EN trend….F>Cl>Br>I;Electron gain enthalpy trend….I Cl>Br>I>Cl->F->Br->I-B.D.E….Cl2>Br2>F2>I2;Iodine is most polarizable halogen.Reactivity and oxidizing power…..F2>Cl2>Br2>I2;Hydration enthalpy…F->Cl->Br->I-;MP and BP trend….F2