Oxidation of Phenols: Quinones. The mixture should be extracted with a weak base (NaHCO3). Phenol is a very weak acid and the position of equilibrium lies well to the left. Phenols are rather easily oxidized despite the absence of a hydrogen atom on the hydroxyl bearing carbon. Justify briefly. Phenol is a weak acid compared to p-nitrophenol. This is because in p-nitrophenol, there is no hydrogen bonding and hence react with bases like NaHCO 3 which is a weaker base.. Phenol is less acidic due to the presence of polar O-H group. The negative charge on the oxygen atom is delocalised around the ring. Therefore, beaker B contains phenol in salt like form. Phenol can lose a hydrogen ion because the phenoxide ion formed is stabilised to some extent. The more stable the ion is, the more likely it is to form. When a structure with a functional group of phenol and amine is extracted with NaOH, the result will be an amine in organic layer and phenol in aqueous layer. Phenol is weaker acid than carbonic acids, Ka value of phenol is very less than that of carbonic acids like CH3COOH, C6H5COOH etc. Therefore phenol does not decompose NaHCO3 solution. Phenol tác dụng được với Na2CO3 nhưng không tác dụng được với NaHCO3 đâu nhé You want to deprotonate phenol by base to make an ionic compound and transfer it to aqueous layer. Will NaHCO3 will be your base of choice given the pKa s of phenol and carbonic acid are 10.0 and 6.4 respectively. In simple words, a relatively stronger acid/base will react to give a relatively weaker acid/base. Among the colored products from the oxidation of phenol by chromic acid is the dicarbonyl compound para-benzoquinone (also known as 1,4-benzoquinone or simply quinone); an ortho isomer is also known.

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