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Directory Results for Study of the Azo Hydrazone Tautomerism in the 4-(9-Anthrylazo) Phenol. The spectroscopic study on 4-(9-anthrylazo) phenol has revealed that the azo dye under study exists in two tautomeric s which are azo phenol and hydrazo keto forms - to Study of the behaviour and mental processes of human beings and other animals