Phenols do not respond to which of these tests? (1) Ferric chloride test (2) Litmus test (3) Bromine test (4) Nessler's reagent test

Answer: (4)

The reagent of Nessler is a mercury(II) iodide (HgI2) solution in potassium iodide and potassium hydroxide, named after the German chemist Julius Nessler. It is used in ammonia testing, where it forms a brown colouration or precipitates.

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