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  4. Phenol xrightarrow[]NaNO2+conc.H2SO4 dark colour xrightarrow[]alkali blue colour This reaction is called

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Q. Phenol $ \xrightarrow[{}]{NaN{{O}_{2}}+conc.{{H}_{2}}S{{O}_{4}}} $ dark colour $ \xrightarrow[{}]{alkali} $ blue colour This reaction is called

Rajasthan PETRajasthan PET 2004

Solution:

This is Libermann's nitroso reaction.

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