Synthetic Colourants — Winter 2021

What do you mean by diazotization? Enlist the methods of it?

Diazotization reaction is carried out at 0-4 0C. Justify.

Explain the concept of diazotization and coupling with suitable reaction mechanism?

What are mordant dyes? Give any one example.

Write short note on: 1. Metanil Yellow 2. Methyl Red

Give the synthesis of methyl orange with reaction mechanism?

Explain the synthesis of any one acid azo dye with reaction mechanism?

What do you mean by chromophores?

Explain reactive dyes with reference to Chemical constitution of reactive systems?

Explain the classification of reactive dyes on the basis of its functionality?

What are reactive dyes? Give general structure?

Explain the steps of reactive dyeing

Explain the classification of reactive dyes on the basis of its dyeing temperature?

What is dispersion?

What are disperse azo dyes? Explain with example?

Elaborate synthesis and applications of disperse dyes?

What is exhaustion?

Explain anthraquinone dyes with suitable example?

Discuss anthraquinone disperses dyes with reference to heterocyclic diazo & coupling components

What is the practical significance of bathochromic shift?

Explain the application of BONA pigments?

With properties,applications and method of synthesis, explain Pthalocyanine Pigments?

Most of the market is occupied with azo pigments. Justify

i) Basic Yellow 21 ii) Basic Orange 21

With properties, applications and method of synthesis, explain Prussian Blue pigments?1