In the reaction A is:

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Understand the Problem

The question is asking what reagent 'A' is in the given chemical reaction involving a diazonium compound and the resulting aromatic compound after a specific reaction.

Answer

H3PO2 and H2O

The final answer is H3PO2 and H2O.

Answer for screen readers

The final answer is H3PO2 and H2O.

More Information

In the given reaction, the diazonium group is replaced by a hydrogen atom. H3PO2 and H2O are commonly used for this conversion.

Tips

Ensure you understand that H3PO2 and H2O are used to remove diazonium groups in reactions involving aromatic amines.

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