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  4. Nitroso amine + phenol xrightarrowconc. H2SO4 red or brown colour xrightarrowbase blue or violet. The name of this reaction is:

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Q. Nitroso amine $ + $ phenol $ \xrightarrow{conc.\,{{H}_{2}}S{{O}_{4}}} $ red or brown colour $ \xrightarrow{base} $ blue or violet. The name of this reaction is:

Rajasthan PMTRajasthan PMT 1996

Solution:

Libermann nitroso reaction,
$ Red\,colour\text{ }\xrightarrow{blue}Blue\text{ }colour $

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