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Normal ferric chloride gives a positive test for phenol as it forms a violet complex with it. This can lead to false positives in other compounds that also react with ferric chloride, making it unreliable for detecting phenol specifically. Instead, a modified version called FeCl3/KI reagent is commonly used for phenol detection as it gives a distinct green color with phenol, allowing for more accurate and specific results.
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What are two tests distinguish between ethanol and phenol?
The ferric chloride test: Ethanol does not react with ferric chloride, while phenol forms a purple color when mixed with ferric chloride. The bromine water test: Ethanol does not react with bromine water, while phenol decolorizes bromine water due to its reducing properties.
Which one give violet color with neutral ferric chloride Salicylaldehyde glycerol benzyl alcohol ethanol?
Salicylaldehyde will give a violet color with neutral ferric chloride.
Why feric chloride give violet colour with phenol?
Ferric chloride reacts with phenol to form a complex that absorbs light in the violet region of the spectrum. The violet color is due to this complex forming between the ferric ions and the phenol molecules, resulting in the absorption of light at specific wavelengths that appear as violet to the human eye.
What causes the color change in the Ferric chloride and phenol reaction?
The color change in the reaction between ferric chloride and phenol occurs due to the formation of a complex between the two compounds. This complex has a different absorption spectrum compared to the individual compounds, resulting in a visible color change.
How is a positive test for phenols using ferric chloride recognized?
A positive test for phenols using ferric chloride is recognized by the formation of a colored complex. When phenols react with ferric chloride, a deep purple or blue color indicates the presence of phenols. This color change occurs due to the formation of an iron-phenol complex.
What are two tests distinguish between ethanol and phenol?
The ferric chloride test: Ethanol does not react with ferric chloride, while phenol forms a purple color when mixed with ferric chloride. The bromine water test: Ethanol does not react with bromine water, while phenol decolorizes bromine water due to its reducing properties.
Which one give violet color with neutral ferric chloride Salicylaldehyde glycerol benzyl alcohol ethanol?
Salicylaldehyde will give a violet color with neutral ferric chloride.
Why feric chloride give violet colour with phenol?
Ferric chloride reacts with phenol to form a complex that absorbs light in the violet region of the spectrum. The violet color is due to this complex forming between the ferric ions and the phenol molecules, resulting in the absorption of light at specific wavelengths that appear as violet to the human eye.
What is the chemistry of the reaction between phenol and ferric chloride in Alkali medium?
the brawn colour is formed and this is due to the presece of the OH functional froup found in the phenol.
What causes the color change in the Ferric chloride and phenol reaction?
The color change in the reaction between ferric chloride and phenol occurs due to the formation of a complex between the two compounds. This complex has a different absorption spectrum compared to the individual compounds, resulting in a visible color change.
How is a positive test for phenols using ferric chloride recognized?
A positive test for phenols using ferric chloride is recognized by the formation of a colored complex. When phenols react with ferric chloride, a deep purple or blue color indicates the presence of phenols. This color change occurs due to the formation of an iron-phenol complex.
What is the mechanism of ferric chloride test?
The ferric chloride test is used to detect the presence of phenolic compounds in a substance. It involves adding ferric chloride solution to the sample, and if phenolic compounds are present, a colored complex forms due to the formation of iron-phenol complexes. The intensity of the color change can be used to estimate the concentration of phenolic compounds in the sample.
What is the colour of ferric chloride with salicylate?
The color of ferric chloride with salicylate is purple. This color change occurs when salicylate is added to a solution of ferric chloride, producing a complex between the two compounds that results in a purple color.
Why would vanillin test positive in a ferric chloride test?
Vanillin contains aromatic groups that can form colored complexes with ferric chloride, resulting in a positive test by producing a color change. This reaction is commonly used to detect the presence of phenolic compounds like vanillin in a sample.
Give four properties of phenol to show how it differ from alcohol?
1-Phenol (carbolic acid) is acidic in nature and turns blue litmus red while alcohol (ethanol) does not, 2-phenol gives violet or blue colour with neutral ferric chloride solution while alcohol does not, 3-phenol freezes to a solid in fridge while alcohol does not, 4-phenol produces bubbles on rough iron surface while alcohol does not.
What are identification tests of phenol?
Some identification tests for phenol include its characteristic sweet, medicinal odor, its ability to turn blue litmus paper red, and its reaction with iron(III) chloride to produce a purple color. Another test involves the formation of a white precipitate when phenol is mixed with bromine water.
What happened to phenol with Iron III chloride reagent?
"Addition of aqueous iron III chloride to a phenol gives a colored solution. Depending on the structure of the phenol, the color can vary from green to purple.
