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In the reaction NO2Br → Δ → NO2Br, A is:

1. Cu2Cl2
2. H3PO2 and H2O
3. H+/H2O
4. HgSO4/H2SO4

Correct answer: H+/H2O

Solution

The reaction involves hydrolysis, where NO2Br reacts with water in the presence of an acidic medium (H+/H2O) to form products. This matches option C.

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