The part of a dye molecule responsible for its colour is called the
Correct answer: B. chromophore
- A. auxochrome
- B. chromophore
- C. monomer
- D. catalyst
Explanation
A chromophore is an unsaturated group such as the azo linkage or a nitro group whose delocalised electrons absorb visible light, and the wavelength absorbed determines the colour seen. An auxochrome such as the hydroxyl or amino group deepens the colour and, more importantly, helps the dye bind to the fibre. A molecule needs both to be a useful dye.
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About Dyes
Dyes are coloured organic compounds that form a stable bond or strong attraction with fibres, while pigments are generally insoluble and need a binding medium. The topic covers chromophores, auxochromes and conjugated systems, as well as acid, basic, direct, reactive, azo and mordant dyes.
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