Which of the following is a characteristic te | vedclass

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(D) Phenols exhibit several characteristic reactions that are used for their identification:$1$. Liebermann's nitroso test: Phenols react with $NaNO_2

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All of the above

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(D) Phenols exhibit several characteristic reactions that are used for their identification:$1$. Liebermann's nitroso test: Phenols react with $NaNO_2$ and conc. $H_2SO_4$ to produce a deep blue or green color.$2$. Coupling reaction: Phenols react with diazonium salts in a basic medium to form azo dyes (typically orange or red).$3$. Aqueous $FeCl_3$ test: Phenols react with neutral $FeCl_3$ to form a violet or green colored complex.Since all three are standard tests for the phenolic group,the correct answer is $D$.

Which of the following is a characteristic test for the phenolic group?

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