Which of the following can be used as laboratory test for phenol?

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It gives purple colour with neutral ${FeCl}_{3}$

It gives yellow ppt. with $NaOH I_{2}$

It gives effervescene of ${CO}_{2}$ with ${NaHCO}_{3}$

It gives silver minor with Tollen's reagent

answer is B.

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Detailed Solution

Blue litmus paper becomes crimson when phenol is present. This demonstrates that phenol is naturally acidic. Similarly, carboxylic acid performs this test. Phenol is a weaker acid than carboxylic acid, and it does not effervesce when combined with aqueous sodium carbonate. laboratory test for phenol gives purple colour with neutral ${FeCl}_{3}$

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