Phenol turns blue litmus paper red. Bromine should not be inhaled because it causes irritation. To identify the presence of phenolic functional group in a given organic compound. To the cooled mixture add 1 mL conc. Compare to carboxylic acid phenol is weakly acidic and it does not give an effervescence with aqueous sodium carbonate. Any of the following test can be carried out to detect the phenolic functional group. On dilution a red colour indophenol is formed which turns to deep blue colour sodium salt solution of indophenol on treatment with sodium hydroxide. The given organic compound is ___________ . The ferric chloride solution used should be freshly prepared should be neutral and very dilute. Phthalein Dye Test. Most phenols give dark coloured solution. Phenols are identified by using Libermann’s test. 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Phenol, resorcinol, Ortho cresol, Para cresol. The organic compound is mixed with solid sodium nitrite (2-3 crystals) and gently warmed for a few seconds. Phenol should be handled with care because it is toxic and corrosive nature. Phenols are weaker acids than carboxylic acids. Compounds with a phenol group will form a blue, violet, purple, green, or red-brown color upon addition of aqueous ferric chloride. If a red, blue or violet colouration appears, then the presence of phenolic group is confirmed. For example, red colouration is obtained with phenol while, with o, m- and p-cresol, it is violet. The colours produced by simple phenolic compounds with ferric chloride solution is listed below. Scientists use litmus paper to test whether the given solution is acidic or basic. Phenol on heating with phthalic anhydride in the presence of concentrated sulfuric acid forms a colourless condensation compound called phenolphthalein. Positive Test. Test for Phenolic Group Test for Phenol.

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