Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem New 2133604 Chemistry Of Intermediates And Colorants I Elective I Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?III (New) EXAMINATION ? WINTER 2018
Subject Code: 2133604 Date: 28/11/2018
Subject Name: Chemistry of Intermediates & Colorants-I(Elective-I)
Time: 10:30 AM TO 01:00 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) Give the difference between dyes & pigments. 03
(b) What is Coal? Explain carbonization of coal. 04
(c) Give small scale preparation of benzene with suitable reactions? 07
Q.2 (a) Discuss the effect of substituents on the rate of Electrophilic
Aromatic Substitution Reaction.
03
(b) Explain the Synthesis of typical dyestuff intermediates based on
benzene.
04
(c) Explain the mechanism of Electrophilic Aromatic Substitution
Reaction.
07
OR
(c) Explain the mechanism of Fridel Craft Alkylation involving
carbocation rearrangement.
07
Q.3 (a) Discuss the Linear free energy relationship in terms of Hammet
Substituent Constant.
03
(b) Elaborate the mechanism of bromination of benzene. 04
(c) Explain the following three types of forces between
organicmolecules depend on the functional group present in order
to increasing the strength:
(i) Van der Waals forces (London Dispersion)
(ii) Dipole-dipole interactions
(iii) Hydrogen bonding
07
OR
Q.3 (a) What is Pitch? What are the applications of pitch? 03
(b) Discuss the Influence of Functional Groups on Reactivity of
organic molecule.
04
(c) Explain the mechanism of Nucleophilic Aromatic Substitution
Reaction.
07
Q.4 (a) Write a short note on: Coal Tar Primaries. 03
(b) Write a short note on: BON Acids. 04
(c) Give the synthesis of Amino G-acid and Amino J-acid. 07
OR
Q.4 (a) Write a short note on: Anthracene 03
(b) Give the reactions of anthraquinone? 04
(c) Explain Synthesis of Naphthol sulphonic acid with suitable
chemical reaction?
07
Q.5 (a) Write a short note on : Onanthraquinone 03
(b) What is meant by active methylene compound? Discuss about
Enols with acid catalyzed enollzation reaction scheme.
04
(c) Explain reversible conversion of a naphthol to a naphthylamine in
the presence of ammonia and sodium bisulfite.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?III (New) EXAMINATION ? WINTER 2018
Subject Code: 2133604 Date: 28/11/2018
Subject Name: Chemistry of Intermediates & Colorants-I(Elective-I)
Time: 10:30 AM TO 01:00 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) Give the difference between dyes & pigments. 03
(b) What is Coal? Explain carbonization of coal. 04
(c) Give small scale preparation of benzene with suitable reactions? 07
Q.2 (a) Discuss the effect of substituents on the rate of Electrophilic
Aromatic Substitution Reaction.
03
(b) Explain the Synthesis of typical dyestuff intermediates based on
benzene.
04
(c) Explain the mechanism of Electrophilic Aromatic Substitution
Reaction.
07
OR
(c) Explain the mechanism of Fridel Craft Alkylation involving
carbocation rearrangement.
07
Q.3 (a) Discuss the Linear free energy relationship in terms of Hammet
Substituent Constant.
03
(b) Elaborate the mechanism of bromination of benzene. 04
(c) Explain the following three types of forces between
organicmolecules depend on the functional group present in order
to increasing the strength:
(i) Van der Waals forces (London Dispersion)
(ii) Dipole-dipole interactions
(iii) Hydrogen bonding
07
OR
Q.3 (a) What is Pitch? What are the applications of pitch? 03
(b) Discuss the Influence of Functional Groups on Reactivity of
organic molecule.
04
(c) Explain the mechanism of Nucleophilic Aromatic Substitution
Reaction.
07
Q.4 (a) Write a short note on: Coal Tar Primaries. 03
(b) Write a short note on: BON Acids. 04
(c) Give the synthesis of Amino G-acid and Amino J-acid. 07
OR
Q.4 (a) Write a short note on: Anthracene 03
(b) Give the reactions of anthraquinone? 04
(c) Explain Synthesis of Naphthol sulphonic acid with suitable
chemical reaction?
07
Q.5 (a) Write a short note on : Onanthraquinone 03
(b) What is meant by active methylene compound? Discuss about
Enols with acid catalyzed enollzation reaction scheme.
04
(c) Explain reversible conversion of a naphthol to a naphthylamine in
the presence of ammonia and sodium bisulfite.
07
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2
OR
Q.5 (a) Write a note on: Evolution of dyestuff chemistry. 03
(b) Discuss the Michel Addition reactions of active methylene
enolates.
04
(c) Explain Bucherer Reaction with suitable chemical reaction? 07
*************
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This post was last modified on 20 February 2020