Phenol and ethanol are distinguished by the reaction with:

red litmus paper

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N a H C O_{3}

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F e C l_{3}

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N a O H

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Solution

The correct option is B $F e C l_{3}$
Phenols react with the $F e^{3 +}$ ion in ferric chloride ( $F e C l_{3}$ ) solution to give complex ions with strong colours from red to purple due to the acidic nature of phenol.
Ethanol doesn't undergo any such reaction.

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