To solve this question, we need to understand the formation of azo-dyes, which generally involves a diazonium salt and a coupling component. Here, sulfanilic acid undergoes a diazotization reaction followed by coupling with a nitrogen-rich compound to form an azo dye.
Diazotization: Sulfanilic acid reacts with sodium nitrite (NaNO2) and acetic acid (CH3COOH) to form the diazonium ion (X).
Coupling Reaction: The diazonium ion then reacts with another aromatic compound to form the azo-dye (Y).
The correct option involves the reaction forming an azo group (-N=N-) linked between two aromatic rings. This is typically represented by \(Ar-N=N-Ar'\), where Ar and Ar' are aromatic groups.
Given the options, the correct azo-dye formed is represented in the following image:
Conclusion: The reaction of sulfanilic acid with NaNO2 and CH3COOH, followed by coupling, forms the azo dye shown in the correct answer image. This matches the typical azo-dye structure.
Therefore, the correct answer is the final option illustrated above.
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Approach Solution -2
The reaction involves the diazotization of sulphanilic acid, which forms a diazonium salt.
This diazonium salt then couples with the compound \( C_6H_5NH_2 \), leading to the formation of the azo-dye product \( Y \).
The structure of \( Y \) matches option (4) in which the diazonium ion is coupled with the benzene ring of \( C_6H_5NH_2 \), forming the characteristic azo linkage (\(-N=N-\)) between the two aromatic rings.
