In the Liebermann's nitroso reaction,the sequ | vedclass

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(B) The Liebermann's nitroso reaction is a chemical test for phenols. When phenol is treated with sodium nitrite $(NaNO_2)$ and concentrated sulfuric

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Red $	o$ deep blue $	o$ green

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(B) The Liebermann's nitroso reaction is a chemical test for phenols. When phenol is treated with sodium nitrite $(NaNO_2)$ and concentrated sulfuric acid $(H_2SO_4)$,it forms a nitroso compound,which further reacts with excess phenol to form an indophenol dye. The sequence of colour changes observed is: $1$. The solution initially turns red or brown. $2$. Upon dilution with water,it turns deep blue or green. $3$. When the solution is made alkaline with sodium hydroxide $(NaOH)$,it turns deep blue. However,in the standard context of the reaction sequence described in textbooks,the colour changes from red to deep blue/green. Therefore,the correct sequence is $Red 	o 	ext{deep blue} 	o 	ext{green}$ (upon dilution/neutralization).

In the Liebermann's nitroso reaction,the sequential changes in the colour of phenol occur as:

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