Download GTU BE/B.Tech 2019 Winter 3rd Sem New 3133604 Introduction To Colorants Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3133604 Introduction To Colorants Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3133604 Date: 5/12/2019

Subject Name: Introduction to colorants
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) What is colour? Enlist various colourants. 03
(b) What are dyes? What are their functions? 04
(c) Differentiate between dyes and pigments? 07

Q.2 (a) Give limitations of electrophilic substitution reaction. 03
(b) Discuss about Hammet substitution constant. 04
(c) Explain the electrophilic substitution reaction with suitable
reaction scheme.
07
OR
(c) How do you synthesize the following: (i) Benzene 1,3-
disulphonic acid (ii) Naphthalene 2,6 & 2,7 disulphonic acid
07
Q.3 (a) What are acid dyes? Give their applications. 03
(b) What are extenders? Give their functions. 04
(c) Give the classification of dyes on the basis of application? 07
OR
Q.3 (a) Discuss about active methylene compound with their
structural formula.
03
(b) Discuss about functional group with structural features of
organic molecules.
04
(c) How do you synthesize the following:
(i) Koch acid (ii) 1-napthol-4 sulphonic acid
07
Q.4 (a) What are light primaries? Enlist them. 03
(b) Explain the applications of pigments. 04
(c) What is colour blindness? Explain its various forms. 07
OR
Q.4 (a) What is additive colour mixing? 03
(b) Explain the functions of pigments. 04
(c) With working, principle & diagram, explain Reflectance
spectrophotometer?
07
Q.5 (a) Identify the functional group present in following compound:
(i) Alkyl Halide (ii) Ketone (iii) Ester.
03
(b) Discuss Enols with their reaction scheme. 04
(c) Explain classification of pigments with example 07
OR

Q.5 (a) Discuss Enolates with their reaction scheme. 03
(b) Write down the nitration reaction scheme under electrophilic
substitution reaction.
04
(c) Explain the influence of functional group on following
properties with suitable examples: Solubility (ii) Reactivity
07

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