Chemistry of Dyes and Pigments paper (WPE 305) from BUTEX affiliated colleges' 2022 Level-3 Term-I finals. Questions address natural versus synthetic chromophores, reactive dye reactions, bromophenol blue synthesis, anthraquinone structures, and azo dye tautomerism.
Level-3 Term-I, Final Exám-2022
Subject: Chemistry of Dyes and Pigments (Code: WPE 305)
Time: 3.0 Hrs. Full Marks: 72
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) Discuss the historical background for the synthesis of commercial textile dye.
(b) Analyze the distinction of natural and synthetic chromophore.
(c) Show the comparison between dyes and pigment on the basis of chemical constitution.
[4+4+4=12]
2. (a) Why direct dyes are substantive? Explain.
(b) Discuss on the features of direct dyes.