Match the dyes given in List-I with their description given in List-II:
Choose the correct answer from the options given below:
नीचे दिए गए विकल्पों में से सही उत्तर चुनें:
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List - I
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List - II
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|---|---|---|---|
| A | Reactive Reactive | I | Applied to fabric as a reduced, water soluble leuco compound Applied to fabric as a reduced, water soluble leuco compound |
| B | Sulphur Sulphur | II | Developed for dyeing acetate fibers Developed for dyeing acetate fibers |
| C | Disperse Disperse | III | Water insoluble dyes Water insoluble dyes |
| D | Vat Vat | IV | Reacts with the fiber molecule by addition or substitution Reacts with the fiber molecule by addition or substitution |
Classification and properties of textile dyes:
Reactive dyes: Form a direct covalent chemical bond with cellulosic hydroxyl groups via nucleophilic substitution or addition -> (IV).
Sulphur dyes: Complex water-insoluble macromolecular dyes containing sulfur and polysulfide linkages -> (III).
Disperse dyes: Insoluble non-ionic dyes with very low water solubility, originally developed specifically for hydrophobic cellulose acetate fibers -> (II).
Vat dyes: Insoluble pigments that must be reduced in alkaline sodium hydrosulfite to a soluble, colorless leuco form, absorbed by cotton, and subsequently re-oxidized inside the fiber -> (I).
रिएक्टिव रंजक रेशे के साथ सहसंयोजक बंध बनाते हैं -> (IV); सल्फर रंजक जल में अघुलनशील होते हैं -> (III); डिस्पर्स रंजक एसीटेट रेशों के लिए विकसित किए गए थे -> (II); तथा वैट रंजक घुलनशील ल्यूको रूप में लगाए जाते हैं -> (I)।