In Liebermann’s test, when sodium nitrite is added to phenol dissolved in concentrated $H_{2} S O_{4}$ a red colour is obtained, the degree of unsaturation of red colour compound is________

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answer is 9.

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liebermanns nitroso reaction the change in color of phenol occurs as brown or red greenish red deep blue red deep blue green red green white white red 6hwm2999 -Chemistry - TopperLearning.com

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