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

[Raghav Gupta]

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?

 

[Lamebert]

Think about the mechanism for phenyl ring activation. How will a positively charged diazo compound react with a nucleophillic phenyl ring?