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  4. Phenol can be tested by

Q. Phenol can be tested by

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Solution:

Phenol may be tested by all the given reagents.
Libermann nitroso test
Solution
Solution
With bromine water
Solution
Phenol reacts with neutral $FeCl_{3}$ solution to give violet colour complex which is soluble in water.
$6\left(\text{C}\right)_{6}\left(\text{H}\right)_{5}\text{OH} & + & \left(\text{FeCl}\right)_{3} & \rightarrow & \left(\left[\text{Fe} \left(\text{O} \left(\text{C}\right)_{6} \left(\text{H}\right)_{5}\right)_{6}\right]\right)^{3 -} & + & 3\left(\text{H}\right)^{+} & + & 3\text{HCl} \\ & & & & \text{Violet colour complex} & & & & $

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