Phenol + FeCl3 Reaction: Distinguish 4-Methylbenzoic Acid

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In summary, the reaction between phenol and FeCl3 can be used to differentiate between 4-methylbenzoic acid and other aromatic acids. This is because the presence of a methyl group on the benzene ring in 4-methylbenzoic acid causes it to react differently with FeCl3 compared to other aromatic acids. This reaction results in a deep purple color, indicating the presence of 4-methylbenzoic acid. Therefore, the phenol + FeCl3 reaction can be a useful tool in distinguishing 4-methylbenzoic acid from other aromatic acids.
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chiral
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phenol + FeCl3..help!

:confused: :confused: please help me... :frown:
phenol gives a violet coloration when we add FeCl3, but will 4-methylphenol gives a violet coloration?!? :confused:
n is it possible to distinguish 4-methylbenzoic acid from 4-methylphenol by adding FeCl3? :confused:
sorry for my poor english :tongue:
 
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The test is fairly specific for phenols, thus I'm thinking that the methyl phenol will also test positive; not all phenols test positive however. Yes, this test will distinguish between phenols and acids.

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  • #3
thx a lot... :biggrin: :biggrin: :biggrin: :biggrin: :biggrin:
 

1. What is the purpose of the Phenol + FeCl3 reaction?

The Phenol + FeCl3 reaction is used to distinguish 4-Methylbenzoic Acid from other compounds. It is a chemical test that helps identify the presence of a methyl group on the benzene ring in 4-Methylbenzoic Acid.

2. How does the Phenol + FeCl3 reaction work?

The reaction involves the addition of FeCl3 (iron(III) chloride) to a solution containing Phenol and 4-Methylbenzoic Acid. The FeCl3 reacts with the Phenol to form a complex, while the 4-Methylbenzoic Acid remains unchanged. The formation of the complex can be observed through a color change, indicating the presence of a methyl group on the benzene ring.

3. What is the expected color change in the Phenol + FeCl3 reaction?

The expected color change is from a colorless solution to a purple or violet solution. This indicates that the FeCl3 has reacted with the Phenol to form a complex, confirming the presence of a methyl group on the benzene ring in 4-Methylbenzoic Acid.

4. Can the Phenol + FeCl3 reaction be used to distinguish other compounds?

Yes, the Phenol + FeCl3 reaction can be used to distinguish other compounds that contain a methyl group on the benzene ring. However, it is important to note that the reaction may not be specific for 4-Methylbenzoic Acid and should be used in conjunction with other tests for accurate identification.

5. Are there any safety precautions to take when conducting the Phenol + FeCl3 reaction?

Yes, FeCl3 is a corrosive and toxic chemical, so it is important to handle it with care. It should only be used in a well-ventilated area and proper personal protective equipment, such as gloves and goggles, should be worn. Any spills should be immediately cleaned up and disposed of properly.

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