1.Diazonium compounds are standard reagents used in synthesis of organic compounds, especially aryl derivatives. Diazonium salts are light sensitive and break down under near UV or violet light. This property has led to their use in document reproduction. 

2.Hinsberg test is a chemical reaction that is used to distinguish between primary, secondary, tertiary amines. This reaction was described first in 1890 by the German chemist Oscar Heinrich Daniel Hinsberg. In the Hinsberg Test, the amines act as nucleophiles and attack the electrophile (sulfonyl chloride).

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