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Br(2) reacts with alkali under cold cond...

`Br_(2)` reacts with alkali under cold conditions to give bromide and hypobromite. It reacts with alkali at room temperature and above to produce bromide and bromate. However, iodine reacts with alkali at all conditions to give iodide and iodate. Explain.

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This is because highly unstable hypoiodite ion, rapidly disproportionates to iodide and iodate, when left undisturbed.
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