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Isomerism

An organic co...

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An organic compound (A) , is insoluble in aqueous NaHCO_3 but soluble in NaOH. (A) on treatment with bromine water , rapidly forms compound (B) . Give structures of (A) and (B). What will be (A) if it does not dissolve in NaOH solution but shows the other mentioned reactions? Also , state how can thiophene , present in a sample of impure benzene be identified

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