The species given below that does NOT show disproportionation reaction is:

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Disproportionation requires the element to have an intermediate oxidation state — it must be able to both increase and decrease its oxidation state.

Step 1 — Oxidation states of Br in each species:

| Species | Oxidation state of Br |
|---|---|
|  |  (highest possible) |
|  |  |
|  |  |
|  |  |

Step 2 — Identify which cannot disproportionate:

has Br in the highest oxidation state (+7). It cannot be further oxidised, so it cannot undergo disproportionation (which requires simultaneous oxidati

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