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  4. Liebermann test is given by which of the following

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Q. Liebermann test is given by which of the following

NTA AbhyasNTA Abhyas 2020

Solution:

Only phenol gives Liebermann reaction. When phenol is dissolved in concentrated $H_{2}SO_{4}$ and few drops of aq. $NaNO_{2}$ added, red colour is obtained which turns blue on addition of NaOH (aq).