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I have read about the neutral FeCl3 test for Phenols, where a positive test is indicated by the colour of the solution which ranges from green to blue to violet. But which specific derivatives of phenol give a specific colour? Or is it random?

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The colour may vary from blue, green or even red depending upon the nature of the phenol.(Source)

  1. o,m,p-cresols and resorcinol gives violet or blue coloration. (source)
  2. beta-naphthol gives green coloration. (Source)
  3. alpha-naphthol gives pink coloration. (")
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