Identifying β-Naphthol Using Dye Test: Acidic, Neutral, and Alkaline Solutions

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SUMMARY

The discussion focuses on the identification of β-naphthol using a dye test across different pH solutions: acidic, neutral, and alkaline. Participants emphasize the necessity of employing dichloromethane as a solvent for β-naphthol in these tests. The conversation also highlights the importance of understanding the interaction between diazo compounds and nucleophilic phenyl rings to determine the acidity or basicity of dyes used in the identification process.

PREREQUISITES
  • Understanding of β-naphthol and its chemical properties.
  • Knowledge of dye chemistry, specifically azo compounds.
  • Familiarity with solvent properties, particularly dichloromethane.
  • Basic principles of nucleophilic substitution reactions.
NEXT STEPS
  • Research the mechanism of diazo compound reactions with nucleophilic aromatic compounds.
  • Study the properties and applications of dichloromethane in organic chemistry.
  • Explore the role of pH in dye chemistry and its effects on color changes.
  • Investigate various methods for identifying phenolic compounds in organic chemistry.
USEFUL FOR

Chemistry students, organic chemists, and laboratory technicians involved in dye testing and compound identification will benefit from this discussion.

Raghav Gupta
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Homework Statement


For the identification of β-naphthol using dye test, it is necessary to use
1. dichloromethane solution of β-naphthol
2. acidic solution of β-naphthol.
3. neutral solution of β-naphthol.
4. alkaline solution of β-naphthol.

Homework Equations


NA

The Attempt at a Solution


There must be a reason which we can apply anywhere not for this question only.
There is something to do with dye but dye is a colour or an Azo compound.
How can we tell dye is basic or acidic?
If we know that also then how to identify the given naphthol?
 
Think about the mechanism for phenyl ring activation. How will a positively charged diazo compound react with a nucleophillic phenyl ring?
 

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